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PetDosageChart

Baytril (Enrofloxacin) Dosage for Dogs

Fluoroquinolone antibiotic ⏱ Onset: 1-2 hours ⏳ Duration: 24 hours

This dosage information is for educational purposes only. Always consult your veterinarian before giving any medication to your pet. Dosages may vary based on your pet's health conditions, other medications, and individual factors.

Content reviewed by licensed veterinarians. This information is sourced from veterinary drug references including Plumb's Veterinary Drug Handbook and the Merck Veterinary Manual.

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Baytril Dosage Chart for Dogs by Weight

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Weight Low Dose Standard Dose Max Dose Frequency
5 lbs (2.3 kg) 11.5mg 23mg (22.7mg tablet) 46mg (2 × 22.7mg) Once daily
10 lbs (4.5 kg) 22.5mg (22.7mg tablet) 45mg (2 × 22.7mg) 90mg (4 × 22.7mg) Once daily
15 lbs (6.8 kg) 34mg 68mg (3 × 22.7mg) 136mg (6 × 22.7mg) Once daily
20 lbs (9.1 kg) 45.5mg (2 × 22.7mg) 91mg (4 × 22.7mg) 182mg (8 × 22.7mg) Once daily
25 lbs (11.3 kg) 56.5mg 113mg (5 × 22.7mg) 226mg (10 × 22.7mg) Once daily
30 lbs (13.6 kg) 68mg (3 × 22.7mg) 136mg (6 × 22.7mg) 272mg (12 × 22.7mg) Once daily
40 lbs (18.1 kg) 90.5mg (4 × 22.7mg) 181mg (8 × 22.7mg) 362mg (16 × 22.7mg) Once daily
50 lbs (22.7 kg) 113.5mg (5 × 22.7mg) 227mg (10 × 22.7mg) 454mg (20 × 22.7mg) Once daily
60 lbs (27.2 kg) 136mg (6 × 22.7mg) 272mg (12 × 22.7mg) 544mg (24 × 22.7mg) Once daily
70 lbs (31.7 kg) 158.5mg (7 × 22.7mg) 317mg (14 × 22.7mg) 634mg (28 × 22.7mg) Once daily
80 lbs (36.3 kg) 181.5mg (8 × 22.7mg) 363mg (16 × 22.7mg) 726mg (32 × 22.7mg) Once daily
90 lbs (40.8 kg) 204mg (9 × 22.7mg) 408mg (18 × 22.7mg) 816mg (36 × 22.7mg) Once daily
100 lbs (45.4 kg) 227mg (10 × 22.7mg) 454mg (20 × 22.7mg) 908mg (40 × 22.7mg) Once daily
120 lbs (54.4 kg) 272mg (12 × 22.7mg) 544mg (24 × 22.7mg) 1088mg (48 × 22.7mg) Once daily
150 lbs (68 kg) 340mg (15 × 22.7mg) 680mg (30 × 22.7mg) 1360mg (60 × 22.7mg) Once daily

What is Baytril (Enrofloxacin) used for in dogs?

Urinary tract infections Skin infections Respiratory infections Ear infections Prostatitis Bone infections

How to give Baytril to your dog

Give enrofloxacin tablets by mouth once daily with food. Do not give within 2 hours of antacids, sucralfate, or calcium/iron supplements as they block absorption. Ensure your dog has access to plenty of fresh water to prevent crystalluria. Complete the entire prescribed course — stopping early promotes antibiotic resistance. Do NOT use in puppies still growing (under 12-18 months). Tablets can be hidden in food or a pill pocket.

Available Forms

Tablet, Injectable, Oral suspension

Give with Food?

Yes — give with food

Side effects of Baytril in dogs

Common side effects

Decreased appetite
Vomiting
Diarrhea
Lethargy

Serious side effects

  • Cartilage damage in growing puppies
  • Seizures
  • Crystalluria
  • Retinal degeneration (cats — rare in dogs)
  • Tendon damage

When to call the vet

Call your vet immediately if your dog shows any of these signs:

  • Joint swelling, lameness, or difficulty walking
  • Seizures, tremors, or disorientation
  • Blood in urine or difficulty urinating
  • Severe vomiting or diarrhea that prevents keeping the medication down
  • Skin rash or signs of allergic reaction

Related Medications for Dogs

Antibiotic (Penicillin)

Amoxil

Amoxicillin

For bacterial infections

View dosage chart
Antibiotic (Tetracycline)

Vibramycin

Doxycycline

For tick-borne diseases (Lyme, ehrlichiosis)

View dosage chart
Antibiotic (Cephalosporin)

Keflex

Cephalexin

For skin infections (pyoderma)

View dosage chart
Antibiotic / Antiprotozoal

Flagyl

Metronidazole

For diarrhea

View dosage chart

Sources & References

The dosage information on this page is compiled from the following veterinary and pharmaceutical references:

  • Plumb's Veterinary Drug Handbook — the standard veterinary pharmacology reference used by veterinarians worldwide.
  • Merck Veterinary Manual — a trusted, peer-reviewed resource for veterinary professionals and pet owners.
  • DailyMed (FDA Drug Labels) — official FDA-approved drug labeling and prescribing information for Enrofloxacin.

Frequently Asked Questions

Why can't growing puppies take enrofloxacin?
Fluoroquinolones like enrofloxacin damage developing cartilage in growing dogs. This can cause permanent joint problems, lameness, and growth plate abnormalities. Enrofloxacin should not be used in dogs under 12 months (small breeds) or 18 months (large/giant breeds) unless no safer alternative exists.
Should enrofloxacin be given with food?
Yes, giving enrofloxacin with food reduces stomach upset. However, avoid giving it with dairy products, antacids, or supplements containing calcium, iron, or zinc, as these can significantly reduce absorption of the drug.
How long is a typical course of enrofloxacin?
Treatment duration varies by condition: simple UTIs may need 7-14 days, skin infections 14-28 days, and deep infections like bone infections may require 6-8 weeks. Always complete the full prescribed course even if symptoms improve to prevent antibiotic resistance.
Is enrofloxacin a strong antibiotic?
Enrofloxacin is a broad-spectrum antibiotic effective against many gram-negative and some gram-positive bacteria. It achieves good tissue penetration, making it effective for deep infections. However, due to resistance concerns, it should ideally be used based on culture and sensitivity testing rather than as a first-line choice.
Can enrofloxacin cause seizures?
Fluoroquinolones can lower the seizure threshold, particularly when combined with NSAIDs. Dogs with a history of epilepsy or seizures should use this drug with extreme caution or use an alternative antibiotic. Report any tremors or unusual neurological signs immediately.

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