@esdmedic7079 - The good news -- it appears -- is that it's not the CRATE that he's concerned with -- it's the closing of the door, perhaps? Being left in a crate for such extended periods of time, would be a great reason to hate the door being closed. Even though a bulldog is going to sleep the day away ANYWAY, perhaps the issue has to do with humans and the door. Maybe too the "aggression" that you see isn't really aggression at all but just the outcome of being anxious? My Bea doesn't have an aggressive bone in her body but when Bo accidentally hits one of the crate doors (or a puppy gate) -- with like a toy or something -- she freaks out and barks at it like it's going to kill her. I picture her saying, "OMG OMG OMG HE TOUCHED THE GAAAAATTTEEEEEE!" Since he's in there for so long at a time, you really MUST crate a tired dog. I hope that's your first step. Secondly, pack leaders don't fuss over their pack members so make less of a production of him going in the crate. He can sense your anxiousness you know. My friend Shelli Dawn used to say "KENNEL UP!" and her three dogs would immediately go into their prospective crates. It was expected and they did it. Perhaps change your inner message to more "It's your nap time!" rather than, "I know you don't like this and I feel bad for you but get in that damn crate...". It makes a difference, I swear. Try instead of giving him a reward for going in there, he can just FIND a reward for going in there. Hide treats inside his blanket. Don't say a THING when closing the door. Just close the door and walk away. All the "Goodbye" stuff we do when we leave is for human's benefit --- the dogs don't understand what we're saying anyway. Sometimes just the "goodbye drama" can make a dog anxious!