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  • Hypothyroidism is an abnormality of the thyroid gland leading to a reduction in the dog’s metabolic state. This can cause many systemic changes including weight gain, hair loss, lethargy, and susceptibility to infections – most noticeably of the skin and ears. Diagnosis is made by a series of blood tests. Treatment is oral thyroid hormone replacement and is lifelong. Clinical signs and blood hormone levels must be monitored regularly as thyroid hormone requirements can change.

  • Ibuprofen is commonly used to treat fever, pain, and inflammation in humans. Ibuprofen poisoning occurs when a dog ingests a toxic dose of ibuprofen, either through misuse or by accident. Most commonly in dogs, clinical signs related to irritation and ulceration of the gastrointestinal tract are observed including decreased appetite, vomiting (sometimes with blood), diarrhea, depression, abdominal pain, dark tarry stools, and bloody stools.

  • Ichthyosis is a rare skin disease in dogs and is sometimes also referred to as "fish scale disease". It generally causes the skin to appear rough and covered with thick, greasy flakes. It is the result of a genetic mutation and certain breeds, listed in this handout, seem to be affected more than others.

  • Icterus is also known as jaundice is an excessive accumulation of a yellow pigment in the blood and tissues, most easily seen in the gingivae and sclerae. Icterus can be caused by hemolysis, liver disease, or obstruction of the bile duct. Your veterinarian will perform screening tests to determine the root cause of icterus. Based on preliminary tests, your veterinarian may recommend fine needle aspiration, needle biopsy, or a surgical biopsy. Icterus will resolve once the underlying disease is identified and treated. The prognosis depends on the underlying cause.

  • Idoxuridine is an antiviral topical medication used to treat viral infections of the eye, such as feline herpesvirus-1 in cats. Idoxuridine comes as eye drops or can be compounded by your veterinarian into an eye ointment. Give as directed. Side effects of idoxuridine include eye irritation. Pregnant women should NOT handle this medication.

  • The iliopsoas is an important core muscle. Injury can occur due to trauma, but it is usually caused by chronic stress. Signs that your dog has a painful iliopsoas can include reduced performance (if a sporting dog), very subtle weight-shifting away from the affected side when standing, or an obvious limp. The initial treatment for acute iliopsoas injuries is activity restriction and pain control for 10-14 days. Rehabilitation therapy can also help.

  • Imatinib is given by mouth and is used off label to treat certain types of cancers in dogs and cats. Give as directed. Side effects may include nausea, vomiting, muscle pain, diarrhea, skin rash, or lack of energy. Do not use in pets that are pregnant or nursing. If a negative reaction occurs, call the veterinary office.

  • Imidacloprid is given by mouth to treat flea infestations in dogs only. Side effects are uncommon but may include vomiting, soft stools, decreased appetite, or difficulty walking. Do not use this medication cats, in puppies less than 10 weeks old or weighing less than 4 pounds, or in pregnant or lactating dogs. If a negative reaction occurs, please call your veterinary office.

  • Imidacloprid is used on and off label and is applied topically to the skin to treat flea infestations. It is frequently used in combination with other medications to treat a variety of parasites. Side effects are uncommon but may include irritation at the application site, or, if the medication is accidentally ingested, drooling, shaking, vomiting, and decreased appetite. Do not use combination products in young pets. Certain combination products should be used in cats. If a negative reaction occurs, please call your veterinary office.

  • Imidacloprid and pyriproxyfen (brand names Advantage®II, Advantage Plus®, Provecta®II) is a topical (spot-on) antiparasitic drug used to repel and kill fleas and lice in dogs and puppies that are at least 7 weeks of age and weigh at least 1.36 kg (3 lb). This medication is labeled for treatment of flea infestations in cats and kittens that are at least 7-8 weeks of age and weigh at least 0.9 kg (2 lb) or 2.3kg (5 lb), depending on the product. Imidacloprid and pyriproxyfen comes in topical solution form that is applied directly to the skin. Do not confuse this medication with K9 Advantix®II, Provecta® Advanced, or Activate®II, similar products labeled for use in dogs only, as those medications contain permethrin, which is toxic to cats.