I would hold off on pulling that tooth.
Get him some bully sticks, and beef kneecaps. Anything that requires heavy chewing. Even tugging games helps loosen them.
I've had baby teeth want to hold on in 3 vizsla pups. None of them had to be pulled.
I understand doing it, if by 8-9 months the tooth is still there. I just think its a little early.
Hi! I just want to let you know that the baby tooth FINALLY came out on its own! Whew!