I used Royal Canin puppy, pups love it and doesnt cause loose stool...
as far a vaccinations, your breeder is best to ask what she has vaccinated him for...I use 5-1 puppy shots a series of three starting at 8 weeks. Its been recommended in some states a series of 4 because of possible parvo outbreaks. Just dont use LEPTO, yorkies tend to have bad reactions to this.
good luck with your new little one
__________________ Kimberly |