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I think his pose probably comes from staffies' fighting past - stand up straight, make themselves big, lean in, etc. It's certainly how they square up to another dog. He does this when he sees a squirrel or cat, but doesn't immediately take off and will happily move to a sit from the position in that photo. Give him a treat and pop the lead on and it's all good.
He will do that low to the ground and slow steps thing to mimic certain dogs he knows, before tearing off for a chase and play.
Squirrel spotted...