My dog's hair is thinning from fleas. How long until it grows back?

Question

Mild, slowly thinning hair over rear back. Classic flea bit dermatitis. I have never seen a flea but, I'm going to treat both dogs just incase. My question is How long before her hair comes back in? How long before I know it is something else? 9month old Bernese Mountain Dog. Pet's info: Dog | Bernese Mountain Dog | Female | unspayed | 9 months and 6 days old | 80 lbs

Ricardo Fernandez, DVM · Accepted Answer

Thanks for using Petco Pet Education Center, formerly Petcoach! Generally, if the correct allergy is being treated, it may take a few weeks for the hair to start coming back. If there is no improvement within 1-2 months, I would assume it may be due to a different kind of allergy such as to the food or environment. Good luck and have a good night!

My dog's hair is thinning from fleas. How long until it grows back?

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