
If you contact the breeder, they should be happy to pass on your details to the other puppy owners, any of who are happy to be in contact can then contact you.
I have found that Facebook is a very6 useful site you could set up a page for the litter, or join the breeders page if they have own, as some breeders will have a page for their owners.
I only have my own page, but have most of my owners join our GB breed group, so lots of them have found their littermates, but a fellow breeder has her own owners page..