I have a staffy x bullterrior (amity) she's only a year and a half old. She's pretty good with her commands sit, shake, lay down etc. But when she's around people she doesn't know especially kids she becomes very protective Wether she's at home or out and about. I've tried smacking her when she barks and snaps at them but she doesn't seem to get the message. I've told her off in a stern voice but still nothing. Any advice is appreciated.
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