Completley agree with Mese, you need the think of other dogs as well as your own. If he bit someone and you had to put him down how would you feel? Awful i imagine so the best way to avoid this is to do everything you can to prevent him doing this. Could be walking him in a place or at a time when other dogs are less likely to be there, or keeping him leeshed with a muzzle. My brother has a female staffie who is brill so maybe it is a one off and visiting a dog physcic may help?
Keep us updated and Good Luck

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Thanks for reading my post - Have a good day!
Mummy to Cody-Lee - 2 Year Old Patterdale X JRT