What tests were run?
Probably just a coincidence, but it is definitely possible that tea tree shampoo caused the problem. It has been known to severely affect small dogs and particularly cats. So especially if he licked really quickly and you didn't see it, etc. So many YT members use it with success, but personally I wouldn't let my pup come near it!
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |