Most reputable breeders will only test stool if they notice a problem. If the puppies stool is off, then they will test. It sounds to me like you got a breeder who wasn't reputable (I'm not trying to be mean or judge). Most of those breeders breed lots of puppies, so they don't check each pup daily. Reputable breeders may only have one or two litters a year, so they are very familiar with their pups, so they notice if something is off.
I haven't ever bought a little puppy, so I don't know the problems that comes with that. All of my pups have been, at least, 6 months or older when I've gotten them. I prefer to skip all the puppy problems.
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