We just bought a puppy this weekend, and we already have a 5 year old border collie/austrailian cattle dog. Our new puppy is an austrailian shepherd/austrailian cattle dog. Our older dog has never had a problem playing with other dogs or puppies before, but now he growls and bears his teeth at her. We are very worried about what is going on, and afraid it is going to escalate into more...what should i do. I need some training tips and ideas on how to get it to stop...NOW!
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