[capt_noonie]

The breeder doesn't even know how the dog will look at maturity and is already asking to use him as a stud. The fact that she is selling to you on full registration raises a lot of red flags for me. Reputable breeders will not sell on full registration to just anyone, especially not one new to yorkies.

But back to your question. Dogs used as studs are hard to have as pets. Everytime there is a female in heat they go crazy. They will mark on everything all the time. Additionally, all pets that are spayed or neutered early will have much less chance of ever getting certain cancers. Neuter your dog and enjoy him as a loving pet. I think the best time to spay/neuter is around 8mos old. If there are any retained baby teeth, the vet will extract them at the same time. Too early and they can have retained baby teeth come in after, and cause crooked teeth, in turn bad breath.