My sister in law has Max's brother, Zero. Zero's a pretty good dog, well mannered (aside from some jumping issues), but recently, he's begun to take a turn for the worst.
Erin has had this dog since he was four months old, he's never shown a hint of aggression beforehand. NOW, when someone comes to the door, they crate him to let the visitor get calmed and situated before letting him out. It worked for a short while, but now when he goes into the crate, he barks, snarls and snaps at THEM (Erin & Mike).
Its progressed over the last week into when Mike leaves, Zero becomes aggressive towards Erin, snapping, barking, scratching, everything.
Its ONLY in the crate, never outside of the crate.
Zero has shown his true side to Mike, and has actually been aggressive towards Mike too, but only once.
Now, Zero is snapping at Erin ALL the time when he's in his crate, she can stand five or six feet from his crate and he snaps and barks, growls, etc.
I personally don't know what would cause a dog to do this, I've never come across it, so I figured I'd let you guys get a run at it.
What would cause this, and what are the right steps to take?
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