Mocha never ever has a resource guarding problem, until very recently I noticed that whenever he is playing with a stuffed toy & Muffin gets near him, he growls at Muffin. He doesn't growl at Missy or anyone else only Muffin & I understand why. Muffin's favorite "game" is to destroy the stuffed animals.. and if she gets a hold of Mocha's toy, 2 minutes later, that toy will be completely gutted & Mocha is only left with the toy's empty skin. I think Mocha has noticed this, so he guards his stuffed toys against Muffin. If he has a plastic toy, or food, he couldn't care less & never growls. Is it something that would potentially escalate to something else more dangerous, and that I should train him out off? (if it's so, HOW?) Whenever he growls (and I catch it), I'd tell him to stop and he'd stop right away. Muffin always keeps her distance when being growled at, so all is fine so far, but I'm thinking of the baby.. Right now, Mocha doesn't have any problems with anyone else but Muffin, but I'm afraid he'll guard against the baby once the baby can reach & grasp things.