I have just brought home a new labradoodle (about 9 weeks). He is very easy going. My other 2 goldendoodles are doing fairly well with him. They are out of sorts tho. Any suggestions? They keep trying to jump and nip at him in a somewhat playful manner. One growls when the puppy comes near, which I find a little upsetting as he has never growled before. Do you think time is of the essence?