You can try obedience now but sometimes the dogs are still to much like wild puppies. Do read the book Marley & Me it will help you keep your sanity. Lucy sounds just like Marley. My grandpuppy (a black lab) is 5 years old & is still hyper & nervous. I use to take him & my other two dogs on 5 mile walks over hills, through streams & woods. He would actually settle down after that. I was wore out though. Another thing are you near a place where your dog can swim in a river or creek. They love the water & fetching things. That would wear her down some. Marley's owner ended up using meds to calm Marley down but mainly during thunder storms. Marley would ripe the house apart & was afraid of thunderstorms. I would not let Lucy play with the older dog she could hurt it. The labs are so big & playful they don't know they are being to rough when they roughhouse with an older dog. Another thing is there a dog part near you? That is a good place to take your dog for exercise. The dogs can run together there & play & jump around in a fenced in area. They all wear each other out while there.