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  • Ichthyosis is a rare skin condition in dogs that is the result of a genetic mutation. The mutation prevents the outer layer of skin from developing properly. It causes the skin to appear rough and covered with thick, greasy flakes. It is sometimes also referred to as "fish scale disease".

  • Icterus is also known as jaundice. It is an excessive accumulation of a yellow pigment called bilirubin in the blood and tissues, most easily seen in the gums and whites of the eyes. 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.

  • Idoxuridine (brand names Dendrid®, Herplex®, Stoxil®) is an antiviral topical medication used to treat viral infections of the eye, such as feline herpesvirus-1 (FHV-1) in cats. It may also be useful for treating canine herpesvirus-1 in dogs and equine herpesvirus-2 in horses. 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.

  • Ilunocitinib (brand name Zenrelia®) is a medication used to control pruritus (itching) associated with allergic dermatitis and control of atopic dermatitis in dogs at least 12 months of age that are up-to-date on vaccinations. It is labeled for use in dogs only. Ilunocitinib comes in tablet form.

  • Imatinib (brand name: Gleevac®) is used to treat certain types of cancer in humans. In dogs and cats, it is used off label to treat mast cell tumors, hypereosinophilic syndrome, fibrosarcoma, and squamous cell carcinoma.

  • Imepitoin (brand name Pexion®) is a behavior modification medication used to treat noise aversion in dogs. It may also be used to treat noise phobias in dogs or as an anticonvulsant to treat idiopathic epilepsy in cats and dogs. Its use may be off label depending on condition, species, and jurisdiction. Imepitoin comes in tablet form.

  • Imidacloprid + flumethrin (Seresto collar) is a topical antiparasitic drug contained in a collar. It is used to control fleas, ticks, and chewing lice on dogs and puppies, and to control fleas and ticks in cats and kittens. If used properly, is effective for 8 months.

  • Imidacloprid + permethrin + pyriproxyfen (brand names K9 Advantix II, Provecta Advanced, Activate II) is a topical (spot-on) antiparasitic drug used in the prevention and treatment of fleas, ticks, mosquitoes, biting flies, and chewing lice in dogs and puppies. Do not use in cats.

  • Imidacloprid + pyriproxyfen (brand names Advantage II, Provecta II) is a topical (spot-on) antiparasitic drug used to repel and kill fleas and lice in dogs and puppies. It is labeled for treatment of flea infestations in cats and kittens. Certain products may be labeled for use in ferrets or rabbits or may be used off label (extra label).