How soon can you leave a puppy at a kennels when you go away on holiday,english mastiff or english springer s?

Reputable kennels or boarding facilities won't board a puppy until it has had its first three sets of shots. And some still won't take them until they have had those, and a rabies. Make sure you get your dog's bordatella vaccine, and rabies in my opinion. That is the first three traditional rounds, and rabies with the final one. Bordatella, or "kennel cough" is a serious condition that can lead to death if untreated, and it is a communicable disease between dogs. Make sure the place you board at is reputable, and requires all noted vaccinations.