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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
The small scars visible from your pictures are likely a result of a bacterial skin infection. He may have had several pustules than can be very irritating and can leave small scars such as this, a bit like human acne. The lesions look to be well resolved.
He looks like quite a character! If he were from the UK, we would describe him as a Staffordshire Bull terrier cross, I realize you are in the US, so he may well be a pit mix.
If most of them are on his front end it could possibly be old fight wounds, yes.