Does the dog sleep in the kennel at night? If not I would start there.
As others have said exercise is your best friend.
Through out the day when you are home throw some treats in the kennel. Let the pup find them. Then start giving a couple treats when you load em up in the kennel. Start putting them in the kennel for very short times. Load them and go outside for a few minutes then go let him out. Keep doing this and start leaving him kenneled for longer each time.
You can also try some of the calming aids from the pest store. They have calming chews that will help with getting him used to things.
As others have said exercise is your best friend.
Through out the day when you are home throw some treats in the kennel. Let the pup find them. Then start giving a couple treats when you load em up in the kennel. Start putting them in the kennel for very short times. Load them and go outside for a few minutes then go let him out. Keep doing this and start leaving him kenneled for longer each time.
You can also try some of the calming aids from the pest store. They have calming chews that will help with getting him used to things.