it sounds like the dog may be wanting to play but its my opinion.... the neighbor hood dog, zack, use to be like that and one day he got out and we were scared! he just wanted to play....he acted like he would bite but he was really scared! sadly he passed and the neighborz have a collie\pitt bull mix named, shaggy. hes the same way he just cant get out.i think they do that to the dogs
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