I keep both mate , jills for little warrens and when I'm just having a little mooch and hobs when I'm out with mates working large warrens and warrens that you know will have wide tunnels like yesterday on sandy land. The fawn pup as just turned 6 month and only 19'' tts she's ACD x whippet greyhound collie whippet greyhound, the rough bitch is 21'' collie x whippet cross beddy whippet greyhound , the brindle bitch is about 23'' saluki x whippet greyhound put back to a greyhound.