Clavamox for Dogs: Uses, Dosing, and What Owners Need to Know
Clavamox is one of the most commonly prescribed antibiotics in veterinary practice. Its combination of amoxicillin and clavulanate gives it broader coverage than plain amoxicillin – defeating the resistance trick many bacteria use to survive antibiotics. Knowing what it treats, how to give it correctly, and what to expect helps ensure the course works.
What Is Clavamox?
Clavamox is the veterinary brand name for amoxicillin-clavulanate potassium, manufactured by Zoetis. The equivalent human product is Augmentin. It is an FDA-approved antibiotic for dogs and cats, available as chewable tablets and as an oral suspension. It requires a veterinary prescription.
The combination of two ingredients is what makes Clavamox more effective than amoxicillin alone. Many bacteria produce an enzyme called beta-lactamase that destroys plain penicillin-type antibiotics like amoxicillin before they can kill the bacteria. Clavulanate blocks that enzyme, restoring amoxicillin’s ability to work against resistant strains.
How the Two Ingredients Work Together
Kills bacteria by binding to penicillin-binding proteins (PBPs) on the bacterial cell wall, blocking cell wall synthesis. The bacterial cell cannot maintain structural integrity and dies. Effective against many gram-positive and gram-negative bacteria.
Has very little antibiotic activity on its own. Its role is to irreversibly bind and inactivate beta-lactamase enzymes – the tools bacteria use to destroy penicillin antibiotics. This protects amoxicillin from being broken down, restoring its killing power against resistant bacteria.
What Infections Clavamox Treats
Clavamox is FDA-approved for dogs for the following indications:
- Skin and soft tissue infections: Wounds, abscesses, pyoderma (bacterial skin infection), cellulitis, and infected lacerations. These are the most common uses.
- Urinary tract infections (UTIs): Bacterial cystitis and upper urinary tract infections caused by susceptible organisms.
- Periodontal disease: Dental and gum infections involving susceptible bacteria.
Veterinarians also prescribe it off-label for respiratory tract infections, some ear infections, and post-surgical infection prevention in appropriate cases. The key is that the causative bacteria must be susceptible to amoxicillin-clavulanate – culture and sensitivity testing is the gold standard for confirming this, especially for recurrent infections.
Dosing by Condition and Weight
Clavamox is dosed at 12.5 to 25 mg per kg of body weight twice daily (every 12 hours). The specific dose and duration depend on the type and severity of infection.
| Condition | Dose | Frequency | Typical Duration |
|---|---|---|---|
| Skin / soft tissue infection | 12.5 mg/kg | Twice daily | 5 to 7 days |
| Deep pyoderma | 12.5 to 25 mg/kg | Twice daily | 21 to 28 days |
| Urinary tract infection | 12.5 mg/kg | Twice daily | 10 to 14 days |
| Periodontal disease | 12.5 mg/kg | Twice daily | 5 to 7 days |
| Respiratory infection | 12.5 to 25 mg/kg | Twice daily | 5 to 10 days |
Clavamox tablets come in four sizes: 62.5 mg, 125 mg, 250 mg, and 375 mg. The oral suspension (62.5 mg/mL) is useful for small dogs and puppies. Tablets are scored for splitting when needed to achieve the correct dose for smaller dogs.
Give Clavamox with food or immediately after a meal. The clavulanate component is more likely to cause nausea and vomiting on an empty stomach. Giving with food reduces GI upset without meaningfully affecting antibiotic absorption. If your dog vomits after a dose on an empty stomach, give all future doses with food.
Storage – Critical for the Suspension
Clavamox tablets are stored at room temperature away from heat and moisture. The oral suspension has a much shorter shelf life: once reconstituted with water, it must be refrigerated and used within 10 days. Any unused suspension must be discarded after 10 days – it loses potency rapidly at room temperature and should never be saved for later use.
What to Do About Missed Doses
If a dose is missed, give it as soon as you remember – unless it is nearly time for the next scheduled dose. In that case, skip the missed dose and give the next one at the regular time. Never double up doses to compensate for a missed one. Consistency matters: the twice-daily schedule maintains a steady antibiotic level in the body that keeps bacteria suppressed. Missed doses allow bacterial levels to rebound and can contribute to treatment failure.
Side Effects and What to Watch For
Clavamox is generally well tolerated. The most common side effects are gastrointestinal:
- Vomiting and nausea: Most common when given on an empty stomach. Usually resolves when given with food.
- Diarrhea: Antibiotic-associated diarrhea from disruption of normal gut bacteria. Probiotic supplementation during and after the course may reduce this.
- Reduced appetite: Mild and usually temporary.
Penicillin-type antibiotics can cause allergic reactions in rare cases. Stop Clavamox immediately and contact your veterinarian if you observe hives, facial swelling (especially around the muzzle and eyes), difficulty breathing, sudden collapse, or severe vomiting within 30 minutes of a dose. These signs require urgent veterinary attention. Dogs with a known penicillin allergy should not receive Clavamox.
Completing the Full Course
One of the most common mistakes with antibiotic treatment is stopping early because the dog appears better. Symptoms often improve 2 to 3 days before the infection is fully cleared. Stopping early leaves surviving bacteria – often the most resistant ones – to repopulate and cause a harder-to-treat recurrence. Always complete the full prescribed course even if the dog seems fully recovered before it ends.
If your dog has had more than one course of Clavamox for the same type of infection – skin, ear, or UTI – ask your veterinarian about bacterial culture and sensitivity testing. This identifies the exact bacteria causing the infection and confirms which antibiotics it is genuinely susceptible to. Repeated antibiotic courses without culture testing risk selecting resistant bacteria and making future infections significantly harder to treat.
Frequently Asked Questions
Antibiotic Treatment That Goes the Distance
Clavamox’s combination formula gives it an edge over plain amoxicillin for the resistant bacteria commonly involved in canine skin, urinary, and dental infections. Give it with food, keep to the twice-daily schedule, and complete the full course even when your dog looks better – these three habits are what make the difference between a cleared infection and a relapse.