Pet Collar Pranks

I don't know nearly enough about the details of your daily life to even begin make an educated guess. And you shouldn't be posting those details online. So I don't see how ATS can help you with this.

Probably a friend is messing with you, or your groomer isn't very conscientious. Maybe your cats are doing voodoo while you aren't at home. But there's no way for us to guess.

In my professional opinion, the underpants gnomes are diversifying their business ventures. But seriously though..they are.

I would think that someone is purposely doing it, as that seems the most logical explanation. You could be correct about there being some mix-ups at the grooming place, and it must be one of those two explanations. Or three explanations, excuse me.