I have a 3.5 month female GSD and. 5 year old GSD. I am hoping someone can give me some guidance on early leash training skills for my puppy. I admit, my older dog never got great on leash. She’s not terrible or anything on it, but if I jog with her on leash, she will pull sometimes. I can take her to public places on leash just fine, but she doesn’t exactly heel. We have always lived in rural areas and near off leash trails. She has excellent recall and stays in sight, so when leash training didn’t come as easily as the other things I was training, I kind of dropped the ball. I don’t want this to be the case with my new pup. What are some of the things you do at this early age to get a dog property leash trained? Also, if I take them on walks together and the older dog is off leash and the puppy in on leash, is this an issue?