I have recently given a home to a 6 yr old male Whippet. Previously he was a stud dog & lived in a well adapted back yard & kennel. He was well cared for but lacked socialisation with other dogs in the outside world. He has been neutered. We live by the sea with wonderful walks for dogs on the beach , sandhills etc I have discovered that Sam becomes very agitated / aggressive when he is on the lead & we meet other dogs. Apart from this he is very well behaved & loves people. Can anyone comment? Thanks.