Here`s another great article:
The title says it all. We have a two year old Shepard mix. He's a fantastic dog overall. Loves just about everybody and all other dogs. Occasionally, my kids will have some friends over, anywhere from age 8 to 15. Sometimes he's fine, and sometimes he growls at them for seemingly no reason. He will run over to greet them, jump up when he's invited for some kisses…and will just growl and lay his ears back. What's weird is he only does this sometimes…and with the same kids. He accepts them one day, and growls at them the next.
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