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  • L-theanine (ANXITANE®) is a nutritional supplement used to treat anxiety in dogs and cats. It is an amino acid naturally found in green tea leaves and is available as a chewable tablet.

  • The lacrimal duct is part of the nasolacrimal system, a series of narrow tubes that allow tears to drain from the eye into the nose and mouth. This duct can sometimes become blocked or fail to develop properly, resulting in tears overflowing and potentially staining the face below the eye. The clinical signs, diagnosis, and treatment options for the condition are explained in this handout.

  • Lactated Ringer’s solution (also known as LRS, Ringer’s Lactate) is a fluid and electrolyte (salts) replacement solution used to correct fluid and electrolyte imbalances in cats, dogs, birds, pocket pets (small mammals), and other animals. Lactated Ringer’s solution comes in injectable form, usually given subcutaneously for at home administration.

  • Leaky gut syndrome refers to an increase in the permeability of the intestines. This condition may be caused by any significant damage to the intestines. Acute cases of leaky gut may be caused by infection, trauma, toxins, or medication overdoses. Chronic cases, in contrast, may be caused by food allergies, long-term NSAID use, or other causes. Treatments will be targeted at the underlying disease causing your dog's leaky gut.

  • Leflunomide is an immunomodulating agent used to treat certain immune-mediated conditions in cats and dogs. It is used off label (extra label) in veterinary medicine. Leflunomide comes in a tablet form that may be specially compounded into a liquid. Wear gloves when handling and do not handle if pregnant or nursing.

  • Leuprolide is a synthetic hormone used to treat adrenal gland problems in ferrets, gonadal issues in birds, and experimentally treat reproductive issues and incontinence (involuntary loss of bladder and bowel control) in dogs and cats. It is given by injection.

  • Lidocaine/lidocaine combinations topical are local anesthetics that provide anesthesia (a numbing effect) to the skin in cats, dogs, and other animals. Combination products may contain other local anesthetics, antibiotics or antimicrobials, steroids, antihistamines, and/or cleansing agents.

  • Lime sulfur topical is a leave-on agent used to treat fungal skin infections such as ringworm (dermatophytosis) and topical yeast infections (Malassezia dermatitis) in dogs, cats, puppies, kittens, and horses. Lime sulfur topical can also be useful in the treatment of several species of skin and fur mites and lice.

  • Linezolid is an antibiotic used to treat multi-drug-resistant, gram-positive bacterial infections in cats and dogs. Its use is limited to susceptible infections with documented resistance to other antimicrobials. Its use is off label in veterinary medicine. Linezolid comes in tablet and powder forms that may be compounded into liquid.

  • LinkSkin® Spray is a topical solution designed to support the skin barrier in dogs and cats by restoring the balance of microflora on the skin. It contains heat-killed lactobacilli and can help prevent skin infections caused by bacteria and yeast.