We have had her for 3 days , and have tried walking her on a collar and a harness, at that moment a harness seems to be the best , but we have read that a harness is not the best way to train a dog.She is a mixed breed , but we think she may have some greyound in her and maybe laborador.Since coming to us she has been fed on tinned food , as she was fed on dried food at the kennels but she does not seem to like this , she does however seem to have a big appertite . Hope this helps .