Antibiotics Dogs & Cats

Doxycycline for dogs and cats

Treats tick-borne diseases such as anaplasmosis and Lyme, respiratory infections and dental disease, and is part of heartworm treatment. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerDoxycycline is a prescription medicine for dogs and cats. A tetracycline antibiotic that stops bacteria from making proteins. The most common side effects: vomiting, diarrhea and low appetite; raised liver values; sun sensitivity.

Key facts

Generic nameDoxycycline
Common brand namesVibramycin
Used inDogs & Cats
TypeAntibiotics
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Treats tick-borne diseases such as anaplasmosis and Lyme, respiratory infections and dental disease, and is part of heartworm treatment. [1]

How it works

A tetracycline antibiotic that stops bacteria from making proteins. [1]

Side effects and cautions

Common side effects: Vomiting, diarrhea and low appetite; raised liver values; sun sensitivity. [1]

Use with care: In cats, pills can get stuck and damage the esophagus, so always follow the pill with water or food. Not for pregnant or nursing pets. [1]

Call your vet right away if your pet has trouble breathing, facial swelling, hives, collapse, or any side effect that is severe or getting worse.

About dosingDosing is your vet's call. We don't list doses because the right amount depends on your pet's weight, age, health and other medicines. Don't change a dose or stop a medicine without asking your vet, and never give a pet medicine meant for people unless your vet tells you to [2].

What it costs

We don't list a price for this one because we couldn't find a reliable public source. Ask your vet or pharmacy for a quote; prices depend on your pet's size, the dose and where you fill it.

Doxycycline FAQ

What is Doxycycline used for in dogs and cats?

Treats tick-borne diseases such as anaplasmosis and Lyme, respiratory infections and dental disease, and is part of heartworm treatment.

What are the side effects of Doxycycline?

Vomiting, diarrhea and low appetite; raised liver values; sun sensitivity.

Does Doxycycline need a prescription?

Yes. It needs a prescription from a veterinarian.

How much Doxycycline should I give my pet?

Only your veterinarian can tell you. The right dose depends on your pet's weight, health and other medicines, so we don't list doses. Never give a pet a medicine prescribed for a person or another animal without asking your vet.

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This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.

Sources (2) — tap to show
  1. VCA Animal Hospitals – Doxycycline (veterinary drug handout)
  2. FDA – Frequently asked questions about animal drugs