
1. Good breeders should give you a diet sheet with ALL the information you need to kknow going forward and most would give you a small supply of the food used, although if you ask ahead of time, you should be able to get out to buy the same.
2. Many breeders don't vaccinate because all too often, the new owner's vet will ignore what's been done and start again. We never vaccinated our puppies unless we had any not gone by the time we had those we were 'running on' (by 10 weeks). In which case they'd all be given the first shots.
3. You should be given a health certificate covering basic health at the time of sale, from their vet, together with information about worming done, when and with what.
We had a 'puppy pack' containing all the information new owners needed to have.
I really don't like Pets4 as a general puppy sale website much as these days, in my breed, more and more 'reputable' breeders are advertising there. Be careful - go visit, see mum and any other adults they have, how they look and where they are being kept. But you need to do that regardless of where the breeder is advertising.