It sounds like you've put some good thought into this before bringing your little guy home
I think it's wise that you neuter your Golden prior to bringing in a smaller dog there will likely be less challenges
But as with any intro with a new dog
supervision is a must and do it on their terms
not yours
Best to keep your puppy with a special puppy formula
you want to least number of possible problems starting out
and changing a puppy's food is one place that can cause stomach problems
ask the breeder what food they are using and also ask your Vet what they recommend
Generally, 8 - 12 weeks
anything sooner will cause stress for your little one
Teeth pulled?
Good God no .... unless there is a specific reason
Hehe ... and favorite thing?
I don't know ... just them being "Yorkie" I guess
They are a pleasure from start to finish everyday