Looking to give my pups second vaccination (9weeks) and my older dogs their yearly booster. I see they now make a 10 way so I figured the more the merrier. Talk to a vet and she said the lepto in the 10 way sometimes causes reactions. What do you guys give for your pups that are very active and in unfamiliar areas as pups. 5 way, 6 way, 7 way, 10 way, etc. So many choices its too confusing . Thanks in advance