I've had my new whippet for just under a month, he is 8 months old. Basically any time I walk out the room, regardless if someone else is there, he will bark like crazy, at night (he sleeps in a crate) he has got a lot better, only barking for half an hour or so before going quiet (most of the time). He has destroyed about 3 beds already, he gets himself in such a panic and ends up panting like mad. It's getting ridiculous, it doesn't matter if we leave the house for 5 minutes or 2 hours, he gets in such a state. We've already tried slowly building him up to it, we give him his kong any time he is left in the crate. Please help!