awww, poor Pasquale. I bet he just twisted it chasing those nasty, nasty birds out of the yard.
It doesn't help that it's probably something minor, they still hurt so we still hurt. I'm told that extra treats, hugs & tummy rubs will take the pain away. Well that's what my 3 tell me whenever they hurt.
Let us know what the vet says. Get better soon Pasquale.