Veterinary Services For Cats

Riverbark Veterinary Hospital treats you and your pets like members of our family, caring for their health and wellbeing with true compassion.


Hyperthyroidism is a disorder caused by excess thyroid hormone in the bloodstream and body. It is the most common hormonal disorder in domestic cats. The same treatment options that exist in humans exists in cats.

These treatment options include:

1. Medication to suppress the thyroid hormone

2. Surgical removal of the thyroid tumor

3. Feeding a life-long low-iodine commercial diet

4. Radioactive Iodine (Radioiodine I-131) therapy to destroy the thyroid tumor. Radioiodine I-131 is the treatment of choice because it is effective and a safe cure regardless of your cat’s age. If left untreated, however, hyperthyroidism can be fatal.

Q1. What is Hyperthyroidism?

Hyperthyroidism is an excessive amount of circulating thyroid hormone in the bloodstream. It is seen in middle-aged to geriatric cats. It is caused by one or more benign tumors of the thyroid gland. Occasionally a carcinoma (cancer) is a very rare cause of hyperthyroidism we see. The most common finding is weight loss due to an increase rate of metabolism. Cats will tend to eat more (sometimes having a ravenous appetite). Weight loss can sometimes be quick or gradual. Other signs include anxiety, nervousness, increased heart rate, vomiting, diarrhea, increased thirst and urination, panting and sometimes a poor haircoat. Overtime if left untreated, hyperthyroidism can have effects on internal organs such as the liver, kidneys, and muscle. Hyperthyroidism is easy to diagnose by your veterinarian based on history, physical, and routine blood tests.

Q2. How is Hyperthyroidism Treated?

Hyperthroidism can be treated medically, surgically, feeding a life-long low iodine diet, or Radioactive Iodine. Medical treatment consists of administering a medication called methimazole once or two times daily. This medication helps control clinical signs but is not a cure. The drug blocks thyroid secretion but does not destroy or remove thyroid tumor. The thyroid will continue to grow while on methimazole. Many cats will develop large thyroid tumors and some will undergo malignant transformation into thyroid carcinomas (cancer). Feeding a low-iodine diet can work but does not destroy the thyroid tumor. The commercially available diet (Hill’s y/d) is sometimes not very palatable and is lower in protein which can sometimes be problematic for cats which require a higher protein diet. Surgery is a cure but can result in severe post operative complications such as hypocalcemia. Radioiodine (I-131) is a cure. This is simple, it is a safe, and is a single subcutaneous injection of Radioiodine (I-131).

Q3. Why is Radioiodine preferred instead of medicine or surgery?

Radioiodine-I-131 has a distinct advantage and is the treatment of choice for treating hyperthyroidism. There is no need for anesthesia and post operative risks from surgery are avoided. No medicine is needed and the only major downside is that your cat will stay in the hospital for a few days (usually 3-5 days). Overall I-131 is a simple, effective, and safe cure.

Q4. How does radioiodine work?

Normal thyroid function requires iodine. Iodine is part of our everyday diet and commonly added to salt. When iodine is ingested, the thyroid gland takes up the iodine. Here the iodine becomes incorporated into thyroid hormone. When your cat receives radioactive iodine, the tumor in the thyroid uptakes the radioactive iodine much like it does normal orally ingested iodine. All of the thyroid tumor will take up the radioactive iodine. Once all of the tumor uptakes to I-131, the radioiodine starts emitting radiation, destroying the overactive thyroid tumor cells. A hyperactive thyroid tumor, suppresses the function of any normal thyroid tissue. The normal thyroid cells will therefore not take up any radioactive iodine. This is very important meaning that cats rarely develop an underactive thyroid gland (hypothyroidism) after radioiodine therapy. After treatment, the normal thyroid tissue will regain full function within 1-3 months. The average cure rate using I-131 is 98% resulting in a safe, effective cure with one single injection.

Q5. Is my cat too old for radioiodine treatment?

Hyperthyroidism in cats can be treated at any age as long as there are no other life-threatening diseases present.

In order to make sure no other problems are seen, a number of screening tests may be done prior to treatment.

Making an appointment and preparing your cat for Radioiodine Treatment:

1. How do I make an appointment for this treatment?

Please ask your veterinarian to send us, by fax or email, a patient referral form (this will be highlighted and they can click on for the form), together with the results of your cat’s history, physical examination, serum T4 level and any routine bloodwork.

All of the routine blood tests must have been done within 1 month prior to treatment.

This routine bloodwork can be done while your cat is on (or off) methimazole.

Since hyperthyroid cats commonly develop secondary heart disease, a chest x-ray is required in all cats that were first diagnosed longer than 6 months.

If other abnormalities are present such as chronic diarrhea, vomiting, an abdominal ultrasound is strongly recommended to rule out other disease processes.

2. What should I do to prepare my cat at home in the week prior to treatment?

If your cat has been treated with methimazole (Tapazole, Felimazole) your cat needs to be off the drug for at least 7 days prior to treatment.

If you or your veterinarian feels your cat’s hyperthyroidism is too severe to discontinue medication, please have your veterinarian contact us to discuss other options.

Treatment Stay During Radioiodine Treatment:

1. How long is the hospital stay during treatment:

The length of stay can vary from cat to cat. We measure the amount of radioactivity emitted by your cat’s thyroid everyday to make sure the thyroid has adequate radioiodine to be effective. By measuring the amount of radioiodine emitted, this will let us know when your cat can be discharged. The length of stay varies from 3 to 5 days.

2. Can I check on my cat during their stay?

Our entire staff is committed to ensuring your cat has the best stay possible. Attention to detail is ensured. Please feel free to call us anytime to check on your furry feline.

3. Can I visit my cat during their stay?

Unfortunately, we can’t allow you to visit during the stay because of the potential for radiation exposure. We will be happy to send you a picture or video during their stay.

4. Are there any side effects or risks with radioiodine?

There are almost no side effects from radioiodine treatment. When your cat returns home, there may be a readjustment period while your cat’s thyroid returns to normal function. Your cat may be quieter and less active . This is due to the metabolic rate returning to normal. Your cat will regain the weight that was lost and his appetite will return to normal and not eat as much as before when he/she was hyperthyroid.

5. Should I bring anything for my cat?

Please feel free to bring any toys, food, etc. with your cat during their stay for radioiodine treatment. We discourage this because anything that is brought into the radioiodine treatment room must not leave and will not be sent home with your cat.

6. What happens when my cat is discharged from treatment?

When your cat’s radioactivity level is below the legal limit to send home, we will contact you to make an appointment for discharge. We will review with you what precautions that you should expect over the following two weeks.

Initial At-Home Care for your cat treated with Radioiodine.

1. What precautions should I take initially when my cat comes home?

Upon discharge, your cat will be minimally radioactive. The level of radioactivity is much lower that when human patients are discharged.

Please take the following precautions:
      a. You can play with your cat and cuddle but limit this time to about 20 minutes/day for 7 days.
      b. A safe distance for your cat throughout the day is at arm’s length
      c. Do not let your cat be on your bed while sleeping.
      d. Do not let your cat be near children or pregnant women.

2. What do I need to do with my cat’s litter?

Most of the radioactive material is excreted in the feces and urine. For the first 2 weeks we advise flushing your cat’s litter in the toilet (make sure you use flushable litter). We also advise wearing gloves during this time.

If flushing the litter is not possible, we advise storing the litter in a container for 3 months to allow the decay of radioactive litter. (If you have any questions about this please don’t hesistate to contact us).

3. These precautions seems like my cat is hazardous to me. How dangerous is the radiation?

The amount of radiation your cat may be emitting is very low. The amount of radiation you might receive from your cat is roughly equivalent to that received when you fly round-trip across the country.

Human patients receiving radioiodine therapy can receive up to 10 times the amount of radiation cats do and still go home the day they are treated. The majority of the radioiodine in urine and feces your cat excretes is while your cat is staying with us.

While these discharge instructions seem alarming, these are extremely cautious and conservative. If you follow our instructions, you and your family will receive almost no exposure at all.

4. How soon will my cat return to normal?

Your cat’s behavior will change within a few weeks. Some cats require 2-3 months for all the clinical signs to return to normal. Your cat will become calmer, gain weight, better grooming, vomiting will stop, and less drinking and less urinating.

5. Should my cat’s thyroid be tested after radioiodine treatment?

We recommend monitoring at 1 and 3 months after treatment.

We will test a T4 level at that time.

At 6 months we recommend that all cats have a complete thyroid profile (T4, T3, free T4, and TSH level)


Since 1975, the veterinarians and support staff at Riverbark Veterinary Hospital have sought to achieve the highest standards of veterinary medicine. We feel that cats are part of the family, yours and ours. Our clients' response to the care we provide is the strongest testament to the quality of care we provide for their cats.

You can find our recent client feedback here.

The Riverbark Veterinary Hospital veterinary hospital offers preventative health care as well as advanced diagnostic and surgical services. Our commitment to quality service has lead our cat care clinic to become well known and respected throughout the veterinary industry. Since 1975, our veterinarians have been accredited by the American Animal Hospital Association.

We Support Every Stage Of Your Cat's Life

As your feline friend grows, they will move through six distinct stages of life:

  • Kitten: 0-6 months
  • Junior: 7 months - 2 years
  • Prime: 3 - 6 years
  • Mature: 7 - 10 years
  • Senior: 11 - 14 years
  • Geriatric: 15+ years

Naturally, as a cat grows and progresses through life, it will undergo physiological changes and face a variety of life events that will require care and attention. From kitten care to geriatric cat medicine, consistent preventive care can make all the difference in the quality of life of your cat. Ultimately your cat's health will impact your relationship with them.

Cats are very good at hiding illness. In fact, most cats will simply become less active and less interactive when very ill. Any signs of illness that a cat may show will be very subtle. Any change in their behavior should warrant a consideration that they may be ill. Many clients will return from work to find that their cat simply does not greet them at the door as usual. This may be an indication that your cat is ill. Because the signs of cat illness are so subtle, if you should notice any obvious changes in behavior please call our office.

A Cat Friendly Certified Hospital

Because the medical needs of cats are unique, our cat hospital utilizes specialized equipment, training of employees and facilities specific to felines. We have a dedicated feline only examination room and we minimize stress by utilizing feline pheromones and soft cozy surfaces which will allow your cat to feel safe and secure. Our staff are trained to allow cats to move at their own pace which allows them to feel less stress during their visit to our hospital. Cats have special needs when it comes to exploring new environments. We understand the needs of cats and how to keep their stress to a minimum. While we cannot make all cats feel completely at home, we can help all cats to feel safe and comfortable during their visit to Riverbark Veterinary Hospital.

Our cat hospital is also certified by the American Association of Feline Practitioners as a Cat Friendly Practice. This accreditation means our veterinary practice specializes in meeting the diverse array of feline needs, including:

  • Understanding the unique needs of cats, thereby making veterinary visits more cat-friendly
  • Understanding how to approach and handle cats in a gentle, empathetic and caring manner
  • Having an appropriate standard of equipment needed to diagnose and treat feline patients
  • Meeting the standards for the facilities and care of hospitalized cats

Cat Health Services and Treatments

At Riverbark Veterinary Hospital we specialize in the following cat health services for cats of all ages, breeds and circumstances:

  • Acupuncture: Our practice utilizes both eastern and western medicine through the cosideration and inclusion of acupuncture in some cases
  • Allergy Testing: Cats commonly face a number of allergens that can cause a wide variety of symptoms, allergy testing can help us identify and properly treat the root cause of some issues
  • Anesthesia: We have the facilities, equipment, medicine and knowledge to ensure your cat stays safe while under anesthesia
  • Bathing and Hygiene: Proper feline hygiene is an important component of a healthy happy lifestyle
  • Behavior Services: Your cat's behavior is not genetically inherent, but can be learned and unlearned with your commitment and our help
  • Boarding: If you are going on a trip and want to make sure that your cat is well taken care of, our staff can ensure high quality affordable care
  • Cancer Treatment: Our communicative, community approach to cancer treatment makes all the difference for you and your cat
  • Cardiology: Our first rate facilities, equipment and professional knowledge gets to the heart of your cat's health and wellness matters
  • Declawing: With a focus on education and compassionate cat care, we can help you decide whether declawing is the right option or whether you should consider alternatives
  • Dental Care: Our knowledge and dental experience can help prevent and treat your cat's dental conditions, including periodontal disease
  • Dermatology: Diagnosing skin conditions early is highly beneficial in treatment. However, if a skin condition has already developed, it must be addressed before it worsens
  • Deworming: Intestinal parasites are a danger both your pet and family, let us ensure that your cat is protected from worms
  • Diagnostic Imaging: Diagnostic imaging allows our veterinarians and technicians to accurately diagnose your cat's condition so that the proper treatment can be prescribed
  • Emergency Care: We specialize in comprehensive emergency care, and our facilities are designed to address any veterinary emergency your cat may have
  • Eye Care: Our doctors are trained to recognize feline specific eye disease and choose treatments based upon efficacy and your cat's tolerance to specific treatments
  • Flea & Tick: We employ safe and effective flea & tick treatments for your cat's health and happiness
  • Heartworm Prevention: We specialize in heartworm education prevention, diagnosis and treatment for your cat
  • Homeopathic and Nutraceutical: Alternative therapies such as homeopathy may also play important roles in the treatment of some conditions
  • House Calls: We are very sensitive to the needs of our clients and patients and in some cases a house call is the best way to deliver care
  • Kitten Care: We help you learn to care for your kitten through education and nutritional awareness while providing the proper preventive medical treatments
  • Laboratory: Our laboratory testing services mean faster and more accurate diagnostics and treatments for your cat
  • Laparoscopic Surgery: Our state of the art tools and facilities allow us to perform less invasive and safer laparoscopic surgery on your cat
  • Laser Therapy: Our cold laser therapy is a tool used to treat cats for post operative pain, arthritis and other inflammatory conditions. It is painless and well tolerated by all cats
  • Medications: When your cat requires medication our doctors will provide the right prescription
  • Microchip ID: Microchipping is the best way to aid in having your cat returned safely should it become lost
  • Nutrition: We will address the specialized nutritional requirements for you cat in different life stages and to aid in the management of certain illness
  • Pain Management: We specialize in effective and compassionate pain management for your cat regardless of age, ability or condition
  • Preventive Care: Our comprehensive preventive care program is the first step to ensuring that your cat has a long healthy life
  • Semi-Annual Wellness Exams: A cornerstone of preventive care, semi-annual wellness exams help prolong life by allowing health issues to be identified and addressed early
  • Senior Care: We understand the special needs of aging cats. We will partner with you to provide the optimal plan for your aging feline
  • Spay or Neuter: We provide a safe and painless surgical experience for your cat
  • Surgery: Our facilities, equipment and staff offer your cat the best option for a successful surgery and recovery
  • Vaccinations: Our veterinarians will recommend an individualized and personalized vaccination protocol based on your cat's needs

Make An Appointment With Riverbark Veterinary Hospital Today

Our success as a cat hospital is a reflection of the health and happiness of our patients and clients. From preventive medicine to comprehensive illness and disease intervention, our cat hospital staff will ensure that your next visit to our cat hospital will resonate with care, respect, transparency and compassion. Schedule an appointment today.

Contact us to schedule an appointment with a cat veterinarian today!

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