I just got a DNA Breed Identification kit in the mail. It cost 59.95 from Amazon. You may be able to get it for less if you search for coupons or deals. You swab the inside of the cheeks with the 2 swabs provided and send them back to the company. If you really need to know it may be worth it.
Your pictures are dark so it is hard to tell but he does look like he has some Austrailian shepherd in him. He could be crossed by any number of breeds. I would say not pit bull though.
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