Hello, I am responding to this conversation which is quite old now but I hope someone can offer advise. Above it is stated "lots of noise and growling and barking, lots of wrestling" describing how greyhounds play. We have a 5 year old female and she not only makes noise, growling and barking but she nips at the other dogs in the dog park. This has become a problem because although we can tell with her wagging tail, etc that she is playing, she has been too rough with most of the dogs. One of the dogs loves the way she plays and when she lays down to rest he goes over and tries to get her up but the majority of them are frightened of her. We used the muzzle on her when this happened but the dog who loves her, treated the muzzle as a new toy and began biting on it and trying to pull it off of her. She is getting a bad reputation in the dog park and she is such a docile sweet girl in every other way. Please let us know what you think.