Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

Will a cold or Zithromax affect my 4-week puppy's development?

Updated on September 23rd, 2025

Pet's info: Dog | Pug | Female | unspayed | 1 month and 4 days old | 1lb

I have a 4 weeks puppy that I will be picking up on Sept 14. The breeder just informed me that the puppy had a cold and was on Zithromax. I'm wondering if a cold at that age or the course of treatment would have any developmental concerns or potential side effects?

1 Answer

Most Helpful Answer

Linda G,  MS, DVM

Answered By Linda G, MS, DVM

Veterinarian

Published on August 29th, 2018

Hello. I would be a little concerned as to why a puppy this young could come down with a cold. The immunity a puppy gets from its mother usually remains very high until it begins to wane around 8 weeks of age. That is why we start puppy vaccinations at this time. My best advice is to have the puppy examined within a day or so of you obtaining possession. I am not concerned about the Zithromax as this is usually well tolerated, but I would like you to make sure the puppy's heart & lungs sound normal. If everything checks out fine, then the respiratory infection should have no impact on the overall health & growth of your puppy. Thanks for using Petco Pet Education Center, formerly Petcoach.
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button