it mite be being put off by the other dog or friend whos with you go by yourself and try it that way I had a bitch like that soon stopped her ran her by herself!!!good look mate
my last dog was a hancock dog 3/4 grey 1/4 collie he was a dog 24inc had him 5 years took me 16months to get him to work sadly passed away last year cracking dog..... good look mate the pup will do you proud