I have three dogs in my home. Two are Shihpoos aged 8 and 9. The other dog is a 5 month old yorkie frenchie cross. The issue is I have been unable to integrate the dogs, and they have to be kept separate at all times. We have sessions where they are together, and the puppy sees the snarls and bites coming at her from the other dog as playing. Our older dog is furious and wants to be left alone and is trying to show her that, and the puppy just bounces and wags her tail and thinks this is a sign of playing. I don't really know how to teach a puppy this means back off in dog world.