Pulling on the leash can be bad in so many ways! My dogs got so excited when they saw another pup that they literally pulled me ACROSS THE STREET to say hi! Can you say dangerous?
Another problem we faced. Three of our four dogs felt like they needed to protect us from everything. Milly barked at just about every critter in the woods, Andy at anyone walking by and Peach even barked at the trees! It was enough to drive you crazy.
I love to garden. Miss Milly loves to dig. One of us had to stop. Hint: It wasn't going to be me!
Luckily we don't have this problem, but I have met a dog or two who does. Obvious Hint: No one wants to be on the "other side" of aggression!