rubbed my boy raw in a month

i ordered the smallest size for my 10 lb chihuahua and he's worn it off and on for the past month. Never really fit him snugly but closest thing I have found for a fit. Seemed to be great for him for the first few weeks, but took it off him for a bath today and found raw spots on his skin underneath where the harness is obviously rubbing him. I noticed he had been trying to get it off himself but didn't realize it was hurting him. I won't put it back on him.

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