Cephalexin Dosage Calculator for Dogs
Disclaimer: This calculator provides estimates only. Always consult your veterinarian before administering any medication to your pet.
What Is Cephalexin for Dogs?
Cephalexin (brand names Keflex, Rilexine) is a first-generation cephalosporin antibiotic commonly prescribed for dogs to treat bacterial infections. As a broad-spectrum antibiotic, it's effective against:
- Skin infections (pyoderma)
- Urinary tract infections (UTIs)
- Respiratory infections
- Ear infections (otitis externa)
- Bone infections (osteomyelitis)
- Wound infections
Veterinarians often choose cephalexin because it's generally well-tolerated by dogs and effective against many common canine pathogens, including Staphylococcus, Streptococcus, E. coli, and Proteus mirabilis.
How to Use the Cephalexin Dosage Calculator
Our interactive calculator above provides personalized dosage recommendations based on:
- Your dog's weight in pounds
- The severity of the infection
- The capsule size you have available
The standard cephalexin dosage for dogs is 10-30 mg per pound of body weight, given every 8-12 hours. The exact dosage depends on:
- Mild infections: 10 mg/lb
- Moderate infections: 15 mg/lb
- Severe infections: 20-30 mg/lb
Important Safety Information
Potential Side Effects
While cephalexin is generally safe, some dogs may experience:
- Gastrointestinal upset (vomiting, diarrhea, loss of appetite)
- Lethargy
- Skin reactions (rare)
- Yeast infections (with prolonged use)
Severe allergic reactions are uncommon but require immediate veterinary attention if they occur.
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Contraindications
Cephalexin may not be appropriate for:
- Dogs with known allergies to cephalosporins or penicillins
- Pregnant or nursing dogs (unless specifically recommended by a vet)
- Dogs with severe kidney disease
Administering Cephalexin to Your Dog
For best results and to minimize side effects:
- Give with food to reduce stomach upset
- Maintain consistent timing between doses
- Complete the full course even if symptoms improve
- Store properly at room temperature away from moisture
Frequently Asked Questions
How long does it take for cephalexin to work in dogs?
Most dogs show improvement within 24-48 hours, but full courses typically last 7-14 days depending on the infection type and severity.
Can I give my dog human cephalexin?
While the active ingredient is the same, human formulations may contain different inactive ingredients. Always consult your vet before using human medications.
What if I miss a dose?
Give the dose as soon as you remember, but if it's almost time for the next dose, skip the missed dose. Never double up on doses.
Are there any drug interactions?
Cephalexin may interact with probenecid and certain other medications. Always inform your vet about all medications and supplements your dog is taking.
When to Call Your Veterinarian
Contact your vet immediately if your dog experiences:
- Severe vomiting or diarrhea
- Difficulty breathing
- Facial swelling
- Hives or severe skin reactions
- No improvement after 3 days of treatment
Natural Alternatives to Consider
For mild infections or as supportive care (always consult your vet first):
- Manuka honey for skin infections
- Cranberry supplements for urinary health
- Probiotics to maintain gut health during antibiotic treatment
- Echinacea (short-term immune support)
Conclusion
Our cephalexin dosage calculator provides a helpful starting point, but always follow your veterinarian's specific instructions. Proper antibiotic use helps ensure effective treatment while minimizing the risk of antibiotic resistance. By understanding proper dosing, administration techniques, and potential side effects, you can help your dog recover safely from bacterial infections.