Use code ONREPEAT at checkout for 65% off up to $65 on Auto-Refill Orders.

Use code SUN60 at checkout for $60 off your next order of $200 or more.*

*Coupon terms and conditions: code SUN60 applicable for one-time or auto-refill orders, for a limited time. $60 off on orders of $200 or more. Coupon codes apply to many, but not all, products. Excluded products include but are not limited to Azodyl, Bravecto, Bravecto Plus, Droncit, Incurin, Mometamax, Numelvi, Optimmune, Posatex, Sentinel, Tri-Heart Plus, VetPen, Vetsulin, compounded and refrigerated medications.

Use code EASYFILL50 at checkout for 50% off up to $50 on your first auto-refill order.*

*Coupon terms and conditions: code EASYFILL50 applicable for first-time auto-refill orders only, for a limited time. Coupon codes apply to many, but not all, products. Excluded products include but are not limited to Azodyl, Bravecto, Bravecto Plus, Droncit, Incurin, Mometamax, Numelvi, Optimmune, Posatex, Sentinel, Tri-Heart Plus, VetPen, Vetsulin, compounded and refrigerated medications.

✨Now Available on Koala: Royal Canin Vet Fresh Diets ✨ Use code FRESH50 at checkout for 50% off your first auto-refill order.*

*Coupon terms and conditions: code FRESH50 applicable for first-time auto-refill orders only. Coupon code applies to the following products: Royal Canin Appetite Stimulation Fresh Frozen Dog Food, Royal Canin Gastrointestinal Low Fat Fresh Frozen Dog Food, and Royal Canin Selected Protein Pork Recipe Fresh Frozen Dog Food. Promotional code valid through December 31, 2026.

Use code SUN40 at checkout for $40 off your next order of $100 or more.*

*Coupon terms and conditions: code SUN40 applicable for one-time or auto-refill orders, for a limited time. $40 off on orders of $100 or more. Coupon codes apply to many, but not all, products. Excluded products include but are not limited to Azodyl, Bravecto, Bravecto Plus, Droncit, Incurin, Mometamax, Numelvi, Optimmune, Posatex, Sentinel, Tri-Heart Plus, VetPen, Vetsulin, compounded and refrigerated medications.

Allergy Relief

Antibiotics

Anxiety, Behavior & Stress

Arthritis, Pain & Joint Health

Dental

Dewormers & Parasiticides

Diabetes & Insulin

Digestive & Gastrointestinal

Ear Care

Eye Care

Flea & Tick

Food

Heart & Blood Pressure

Heartworm

Immune Support

Respiratory Care & Asthma

Seizure & Epilepsy

Skin & Coat

Thyroid & Hormone

Urinary Tract & Kidneys

Vitamins & Supplements

All Cat Food

Dry Food

Treats

Veterinary Diets

Wet Food

All Dog Food

Immune support supplements for cats to help strengthen natural defenses. Trusted care from Koala Health.

Immune Support for Cats

immune support

Cyclosporine (Atopica) is used to suppress the immune system to treat allergic skin and immune-mediated conditions.

Atopica for Cats

Azathioprine is used to suppress the immune system to treat immune-mediated conditions.

Azathioprine

Cyclosporine (Cyclavance) is used to suppress the immune system to treat allergic skin and immune-mediated conditions.

Cyclavance

Cyclosporine is used to suppress the immune system to treat allergic skin and immune-mediated conditions.

Cyclosporine

Mycophenolate is used to suppress the immune system to treat immune-mediated conditions.

Mycophenolate

Prednisone and prednisolone (PrednisTabs) are steroids used to treat a wide variety of dog and cat illnesses including inflammatory conditions, immune-mediated diseases, certain cancers, and Addison's disease (hypoadrenocorticism).

PrednisTabs

Purina® Pro Plan® Veterinary Supplements FortiFlora® SA Synbiotic Action contains a powerful combination of probiotics and prebiotics to support your cat’s GI health, with probiotics to nourish your cat’s gut and prebiotic fiber to support a healthy microbiome.

Purina Pro Plan FortiFlora PRO Synbiotic Action Probiotic Supplement for Cats

Probiotics supply "good" bacteria to the gut and promote overall digestive health.

Purina Pro Plan FortiFlora Probiotic for Cats

Diphenhydramine (Vetadryl) is an antihistamine used to treat allergic reactions and itchiness due to allergies.

Vetadryl

Lysine (Viralys) is an amino acid supplement used as an antiviral agent in cats.