A vet check is a good idea, just to rule out any physical cause. But dogs also go through phases where they are just naturally more cautious and sensitive, as well. Might not be a bad idea to just ease off on the socialization for a while. Don't coddle him of offer him sympathy, just make his trips out a little less frequent and see if it makes a difference. If it is just a phase, in a few weeks he should be looking forward to those Petsmart visits again.
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