Lepto is the "L" in the 5 way puppy/booster jabs ... DHLPP (Distemper, Hepatitis, Leptospirosis, Parainfluenza and Parvo) ...so if the pup was jabbed at all, it would have been jabbed for it. At 14 weeks it "should" have recieved probably 2 jabs. Over here we normally jab a pup every 3 weeks from about 7 weeks on to 16 weeks or so, because the studies on the actual viability of jabs is frightening ... they have about a 30% viability rate simply due to manufacture and shipping errors.
We NEVER bring a new dog on our yard, or even ALLOW someone to bring their dogs here, if they aren't jabb