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I highly doubt that the peanut butter is the culprit in this situation. I know A LOT of people who give their dogs either straight peanut butter or treats that have peanut butter in them. A good thing to do would be to spread a teeny bit of peanut butter inside a Kong toy or a hollow bone and then freeze it to make it more difficult to get out. Make sure that when you leave him, don''t make a big deal about it and give him plenty to do. There are a lot of new food stuffable toys available -- I personally really like the Busy Buddy Twist-and-Treats, Everlasting Fun Ball and the Kongs. Also, make sure that he has something to chew on in order to sooth himself and it is always nice to have something to snuggle with!
There are MANY reasons why your dog may have diarrhea. The anxiety can make their stools loose, as can going too often, food allergies or parasites. The first thing I would do is rule out any medical reasons with your vet and then begin crate training. The following is a good schedule for training:
Be sure to take it nice and slow when you begin to acclimate your dog to the crate. Always give him special treats and NEVER, EVER use it to punish him. You''ll be amazed at how soon your dog will begin to think of it as his safe place!