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  • Well-bred Old English Sheepdogs are placid, adaptable individuals who are loving and loyal to their chosen people. These big, lovable dogs can be just the ticket for active households whose members do not mind spending a lot of time tending the tresses of their canine companions.

  • Olive leaf extract is a supplement made from the Olea europaea tree. It is mainly used to help fight viruses and bacteria that cause infections (antiviral and antimicrobial). In cats, it has been used as an additional therapy to treat feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV). It has also been used in the treatment of high blood pressure, high blood sugar, and inflammation.

  • Olopatadine ophthalmic is an antihistamine medication used to treat pruritus (itchiness) of the eyes caused by allergies in animals. Olopatadine ophthalmic comes in liquid drop suspension form.

  • Olsalazine is a drug used to treat inflammatory bowel disease, chronic colitis, and lymphocytic-plasmocytic colitis in dogs. There are no veterinary products available for prescription. The human product (Dipentum®) may be prescribed for off-label use in pets.

  • Omeprazole (brand names Gastrogard®, Losec®, and Prilosec®) is used in the treatment of ulcers occurring in the stomach and upper part of the small intestine in dogs and cats. It is also used to treat or prevent gastric erosions caused by drugs, to treat Helicobacter infections and acute gastritis in dogs, and to treat gastroenteritis in ferrets.

  • Ondansetron (brand names Zofran®, Zuplenz®) is given by mouth or injection and is used off label in dogs and cats to treat vomiting. Side effects are not common but include constipation, sleepiness, or head shaking. Do not use in pets that are allergic to the medication.

  • Onions, garlic, chives, and leeks are common causes of poisoning in cats, with garlic being the most toxic. Cats are extremely sensitive to poisoning. All forms are poisonous to cats, including raw, cooked, dried, powdered, and liquid preparations. This handout outlines signs, treatment, and prognosis for this poisoning.

  • Onions, garlic, chives, and leeks common causes of poisoning in dogs, with garlic being the most toxic. All forms are poisonous to dogs, including raw, cooked, dried, powdered, and liquid preparations. This handout outlines signs, treatment, and prognosis for this poisoning.

  • Open fontanelles are soft spots in the skull, or gaps between the skull’s growth plates. They can be normal in young puppies, especially small breeds, and typically close or harden by 9-12 weeks of age. This handout discusses causes, diagnosis and treatment of open fontanelles in small breed puppies.

  • Ophytrium is an ingredient extracted from Japanese mondo grass (Ophipogon japonicus) that is used in several topical treatments (i.e., Douxo® S3 products). It is used on dogs and cats with oily to flaky skin. It is believed to help control odor and dandruff, soothe and hydrate the skin, maintain the skin barrier, untangle the fur, and soften the coat.