Hey there! My labradoodle is 12 weeks old (we've had him for four weeks) and he is in puppy training class and doing pretty well with the commands "sit" "wait" and "down". The one that he is most stubborn on is the "come" command. We use very excited voices, clap and treats..but there are times when he just sits and looks at us and refuses to come. He does this with or without being on the leash. He does better for my husband who can whistle (but I cannot whistle ). Any suggestions? I know this is an important command and I'd like him to come when I call him each time. Thanks!