[JoeyP]

Hmm ... that's too bad
The problem with aggression is that it sometimes gets worse if not nipped in the bud
You said you have some other dogs
so it's not surprising that this dog's aggression is getting worse because he feels he has to compete for some things
Instead of putting him in his crate
why don't you try this ..... try putting a treat in your hand
and let him search for it
if he growls whiles he's licking your hand take it away
if he wags his tail and is good give it to him and praise him
also while he is eating move his bowl
and praise him if he let's you do it without growling
take the food away if he does
and keep trying to set up situations where he might become aggressive
and prasie and treat him if he doesn't growl or bite