Alot would depend on the breed of puppy, the age, how quickly it was caught, and just the overall hardiness of that particular puppy. I have seen older puppies that were caught early be released after two or three days. I have seen small breed puppies be held for two to three weeks just to support their more fragile systems.
Sometimes, vets will do the best they can to "push" puppies through treatment, relying on intensive care at home to cut down on costs when that is a concern. Sometimes it works out, sometimes, a fragile system doesn't continue to improve and backslides. Hard to predict.
I caught the back end of this so sorry if these questions have been answered. Why didn't the breeder vacccinate this guy? He was young but being a large breed puppy and knowing that being weaned he had no resistance to viruses he should have NEVER been in a situation around a large number of dogs and puppies. He really should have been vaccinated prior to being introduced to that environment.......period.
I would stongly suggest that you contact your breeder. I am not sure of the specific terms of your purchase but the breeder should be assisting on these costs. In many states, it is illegal for her/him to sell or transfer with intent to sell an unvaccintated puppy. In many states, it is illegal to sell any puppy under the age of 8 weeks.
I hate to come off hardassed but the life and death fight this puppy is living right now could have been totally avoided had the breeder been responsible and not tried to skip costs. Did you get a health certificate?
I bred bullmastiffs for many years. They are often weaned younger than alot of breeds because of the large litters and boisterous behavior of the pups being hard on the mother. With that being said, the main reason that puppies are kept with their litter until after 8 weeks isn't the weaning part but more of the matter of identity and maturity. Pups taken from the litter before 8 weeks tend to have more anxiety and behavioural issues it is speculated. Alot of people want their pups before 8 weeks thinking they have a better bonding time and I really don't feel that's the case. I think the pups can become too dependant and needy and have a hard time with seperation. Just my two cents.
If you want any help with the statues and all that fun stuff let me know.