
It's normal practice for breeders of toy breeds to keep puppies till 12 weeks, so I doubt your breeder will be persuaded to part with one of her babies at 10 weeks. She''ll be conserned with what is best for the puppy not what is most convenient for you. It's like me trying to obtain a pup at 6 weeks instead of 8, the breeders just won't wear it.
I can't see a problem with having both innoculations done by your own vet, a chihuahua is easily carried for socialisation, if it can't go down for an extra week or two.
Sorry, I think you are just going to have to patient.
Dawn R.