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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Allergy relief and medicine for dogs, from antihistamines to prescription treatments. Vet-approved care delivered by Koala Health.

Allergy Relief & Medicine for Dogs

allergy relief

Hydroxyzine is an antihistamine used to treat itchiness due to allergies.

Hydroxyzine

Triamcinolone (Kenalog) is a steroid used to treat inflammatory conditions, especially allergy and skin disorders.

Kenalog

Loratadine blocks histamine’s effects to reduce itchiness associated with allergies. It can also be used as an additional treatment for itching related to certain types of cancers (eg, mast cell tumors)

Loratadine

Methylprednisolone is a steroid used to treat inflammatory conditions, especially allergy and skin disorders.

Methylprednisolone

Numelvi

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).

PrednisTabs

Temaril-P is an oral medication that treats both coughing and itchiness due to a wide variety of causes.

Temaril-P

Triamcinolone is a steroid used to treat inflammatory conditions, especially allergy and skin disorders.

Triamcinolone

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

Vetadryl

Zenrelia is an innovative, once daily treatment to break the itch-scratch cycle that lets dogs get back to normal. Zenrelia is indicated for the control of pruritus associated with allergic dermatitis and control of atopic dermatitis in dogs at least 12 months of age. Zenrelia targets itch where it starts. Zenrelia works by interrupting key cytokine signaling pathways involved in allergic itch and breaks the itch-scratch cycle.