I'm no expert...but I've seen something like that on Zeeva in the same exact area. Never thought much of it at all and it cleared up but I don't know how long it took because I didn't pay attention to it. Your pup's underside is much cleaner than Zeeva's. Do you wash your pup or let your pup play in water a lot...? Zeeva is pretty brown down there...
I do wash her 2-3 a month but she doesn't really play In water
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