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Why is my dog losing fur in a snail trail pattern on his sides?

Updated On September 23rd, 2025

Pet's info: Dog | Staffordshire Bull Terrier | Male | neutered | 140 lbs

My dog has what looks like a snail trail of missing fur on both of his flanks. Please advise what you think it could be

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1 Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on February 21st, 2018

The hair loss on Bobby's flanks is certainly quite prominent. This could be caused by endocrine/metabolic disorders like hypothyroidism or Cushing's disease, underlying allergies to food, the environment or fleas, mange, ringworm, among other conditions. Regardless, it would be best for Bobby to go to the vet for evaluation. The vet will be able to start with a physical exam, and based upon those findings and his clinical history at home (i.e. itching, lethargy, weight fluctuations, changes in drinking or urination, diet changes, lifestyle, etc.), will be able to determine the next diagnostic steps. Bobby may need to have blood testing, skin scrapes, fungal cultures, and/or skin cytology to get to the bottom of this issue. I hope that all goes well!

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