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Puppy chest rash: Is it diet, environment, and what are remedies?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered | 4 months and 10 days old | 17 lbs

My labrador puppy (4months) has a rash on his chest, I was forced to change his normal diet from blue buffalo to puppy chow for a week. Could that have been a possible cause? Also he is staying outside on sand and a dog house but he doesnt like the dog house. Could it be the environment? He doesn't have any ticks. Is there a cheap remedy? I'm just a teen with a part time and I love my

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1 Answer

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Answered By Lauren M. Jones, VMD

Veterinarian

Published on June 30th, 2017

I'm sorry to hear that Hatchi has developed this skin lesion. Possible causes include a bacterial skin infection (most commonly caused by underlying allergies), ringworm, mange, or simply irritation from the sand outside. Without diagnostic testing at the vet's office, it is impossible to definitively determine the cause of this lesion. However, given his recent changes, you can try a few things at home to try to resolve the issue with a bit of trial and error. For starters, try to return Hatchi to his normal diet, but be sure to do so gradually by mixing the foods together over 5-7 days to decrease the likelihood of causing gastrointestinal upset. Try to keep him indoors, particularly while this lesion is healing. If possible, try to eliminate sand from his normal habitat since this can be quite abrasive. While indoors, leave his collar off to prevent moisture from building up under the collar and clean the collar well. You can also try bathing him in a medicated shampoo (this is one example: http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=27982). Make sure that Hatchi is receiving a high quality flea and tick preventative, such as Nexgard, Bravecto or K9 Advantix II regularly, even though you haven't had any noticeable issues. If after all of these changes the skin lesions persist or worsen, Hatchi will need to go to his vet for further evaluation. I hope that all goes well!

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