Is it bad for dogs to take Doxycycline and Vitamin C?

I don’t know what’s going on, and I’m hoping someone can help. My dog, Max, has been on Doxycycline for about a week now because of a tick bite, and my friend suggested giving him Vitamin C to boost his immune system. I started doing that a couple of days ago, but now Max seems super sluggish and not himself at all, especially in the mornings. He usually jumps around like crazy when I come home from work, but yesterday he just lay there and barely lifted his head. I’m wondering if the combination of these meds is making him feel weird or if it’s something else entirely. Has anyone else experienced this? I want to make sure I’m doing the right thing for him.

Embark Dog DNA Test

Recommended Product

Your dog's DNA could reveal hidden health risks.

Screen for 270+ genetic health risks and 350+ breeds. Veterinarian developed, research partner of Cornell University.

$199 USD
$139 USD
Save $60· Free US Shipping

Answer

Thanks for reaching out — let's unpack this. Giving your dog Doxycycline, an antibiotic often used to treat infections, alongside Vitamin C, typically isn’t problematic. Doxycycline is generally safe when prescribed by a veterinarian, and Vitamin C is a water-soluble vitamin that many people give to their pets to support their immune system.



However, there are a few things to keep in mind. While Vitamin C is generally safe in moderate amounts, too much can cause gastrointestinal upset, like diarrhea or stomach pain, in dogs. It’s important to ensure your dog is getting an appropriate dose. As for Doxycycline, make sure it’s given with a small amount of food to help prevent stomach upset.



Monitor your dog for signs of tummy trouble, like vomiting, diarrhea, or loss of appetite, especially if this is their first time on these supplements or medications. If any of these occur, it’s a good idea to pause and get in touch with a vet for guidance.



If you're noticing anything unusual or if your dog has any pre-existing conditions, scheduling a video consult with Dial A Vet could provide more personalized advice. Always good to have expert guidance tailored to your pet’s needs!

Clinically Approved Standard by Dial A Vet Veterinary Team

Disclaimer: The customer and expert messages presented herein may have been altered with artificial intelligence or modified to enhance readability and safeguard the privacy of individuals. This content is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is experiencing a medical emergency, contact your local veterinarian or emergency animal hospital immediately. Talk to a vet now.

Embark Breed + Health Dog DNA Test

Recommended for Dog Owners

Embark Breed + Health Dog DNA Test

18,899 Reviews

The most comprehensive dog DNA test. Screen for 270+ genetic health risks and identify breeds from 350+ breeds, types & varieties.

$199$139Save $60

Free US Shipping · Veterinarian Developed

Next available appointment

Loading…