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PetDosageChart

Vibramycin (Doxycycline) Dosage for Dogs

Antibiotic (Tetracycline) ⏱ Onset: 1-2 hours ⏳ Duration: 12-24 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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Vibramycin 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 11.5mg 23mg every 12-24 hours
10 lbs (4.5 kg) 22.5mg 22.5mg 45mg (50mg tablet) every 12-24 hours
15 lbs (6.8 kg) 34mg 34mg 68mg every 12-24 hours
20 lbs (9.1 kg) 45.5mg (50mg tablet) 45.5mg (50mg tablet) 91mg (2 × 50mg) every 12-24 hours
25 lbs (11.3 kg) 56.5mg (50mg tablet) 56.5mg (50mg tablet) 113mg every 12-24 hours
30 lbs (13.6 kg) 68mg 68mg 136mg every 12-24 hours
40 lbs (18.1 kg) 90.5mg (2 × 50mg) 90.5mg (2 × 50mg) 181mg every 12-24 hours
50 lbs (22.7 kg) 113.5mg 113.5mg 227mg every 12-24 hours
60 lbs (27.2 kg) 136mg 136mg 272mg every 12-24 hours
70 lbs (31.7 kg) 158.5mg (3 × 50mg) 158.5mg (3 × 50mg) 317mg every 12-24 hours
80 lbs (36.3 kg) 181.5mg 181.5mg 363mg every 12-24 hours
90 lbs (40.8 kg) 204mg (4 × 50mg) 204mg (4 × 50mg) 408mg (8 × 50mg) every 12-24 hours
100 lbs (45.4 kg) 227mg 227mg 454mg (9 × 50mg) every 12-24 hours
120 lbs (54.4 kg) 272mg 272mg 544mg (11 × 50mg) every 12-24 hours
150 lbs (68 kg) 340mg (7 × 50mg) 340mg (7 × 50mg) 680mg every 12-24 hours

What is Vibramycin (Doxycycline) used for in dogs?

tick-borne diseases (Lyme, ehrlichiosis) respiratory infections urinary tract infections leptospirosis

How to give Vibramycin to your dog

Always give doxycycline with food and water to prevent esophageal irritation. Do not give dry — follow with a small amount of water or food to ensure the pill reaches the stomach. Avoid giving with dairy products, antacids, or iron supplements, as these reduce absorption.

Available Forms

tablet, capsule, liquid

Give with Food?

Yes — give with food

Side effects of Vibramycin in dogs

Common side effects

nausea
vomiting
diarrhea
decreased appetite
esophageal irritation

Serious side effects

  • esophageal ulceration
  • severe photosensitivity
  • liver toxicity
  • tooth discoloration (in puppies)

When to call the vet

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

  • Vomiting or difficulty swallowing after dosing
  • Refusal to eat or drooling (may indicate esophageal irritation)
  • Diarrhea that is severe or bloody
  • No improvement after 3-4 days of treatment
  • Skin rash or unusual sensitivity to sunlight

Related Medications for Dogs

Antibiotic (Penicillin)

Amoxil

Amoxicillin

For bacterial infections

View dosage chart
Fluoroquinolone antibiotic

Baytril

Enrofloxacin

For Urinary tract infections

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 Doxycycline.

Frequently Asked Questions

What does doxycycline treat in dogs?
Doxycycline is most commonly used to treat tick-borne diseases like Lyme disease, ehrlichiosis, and anaplasmosis. It is also effective against respiratory infections, urinary tract infections, leptospirosis, and certain wound infections. It works against a broad range of bacteria.
How long does a dog take doxycycline?
Treatment duration depends on the condition. For tick-borne diseases, a typical course is 28-30 days. For respiratory or urinary infections, 7-14 days is common. Always complete the full prescribed course to prevent antibiotic resistance.
Can doxycycline cause vomiting in dogs?
Yes, nausea and vomiting are the most common side effects. Giving doxycycline with food significantly reduces this risk. If your dog vomits after taking doxycycline, try giving it with a larger meal. If vomiting persists, contact your vet.
Can I give my dog doxycycline on an empty stomach?
It is not recommended. Unlike some antibiotics, doxycycline should be given with food to reduce nausea and prevent esophageal irritation. Always follow with water or a small treat to ensure the pill reaches the stomach.

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