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

Use code DOGDAY40 at checkout for $40 off your next order over $100.*

*Coupon terms and conditions: code DOGDAY40 applicable for one-time or Subscribe & Save orders, 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. Promotional code valid through August 23, 2026.

Use code DOGDAY60 at checkout for $60 off your next order over $200.*

*Coupon terms and conditions: code DOGDAY60 applicable for one-time or Subscribe & Save orders, 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. Promotional code valid through August 23, 2026.

Now Available on Koala: Royal Canin Vet Fresh Frozen Diets! Use code FRESH50 at checkout for 50% off your first Subscribe & Save order.*

*Coupon terms and conditions: code FRESH50 applicable for first-time Subscribe & Save 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.

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Digestive and stomach medicine for dogs to support gut health and digestion. Shop vet-approved options at Koala Health.

Digestive & Stomach Medicine for Dogs

digestive & gastrointestinal

Mirtazapine is an oral or transdermal medication used as an appetite stimulant and to control nausea and vomiting.

Mirtazapine

Cobalequin is used to supplement vitamin B12 in animals who lack it due to gastrointestinal disorders.

Nutramax Cobalequin® B12

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

Nutramax Proviable-DC®

Nutramax Proviable® Probiotics Diarrhea Support Kit

Omeprazole reduces stomach acid production.

Omeprazole

Ondansetron is used to treat nausea and vomiting due to a variety of causes.

Ondansetron

Pancreatic enzymes (Pancreas Powder) are used in conditions like exocrine pancreatic insufficiency, in which the body does not supply its own digestive enzymes. This medication may be dispensed under one of several different brand names.

Pancreas Powder

Pancreatic enzymes (PancrePlus Powder) are used in conditions like exocrine pancreatic insufficiency, in which the body does not supply its own digestive enzymes.

PancrePlus Powder

Pancreatic enzymes (PancrePlus Tablets) are used in conditions like exocrine pancreatic insufficiency, in which the body does not supply its own digestive enzymes.

PancrePlus Tablets

Pancreatic enzymes (Pivetal Pancresorb Powder) are used in conditions like exocrine pancreatic insufficiency, in which the body does not supply its own digestive enzymes. This medication may be dispensed under one of several different brand names.

Pivetal Pancresorb Powder

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

Prednisone

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).