Parvo is very scary. It can live on surfaces with no host for up to 2 years I have heard. So a breeder with the problem is likely to have it reoccur. I think 6 months outside.
You can clean all surfaces with bleach, and let it sit and clean it off, and that will kill it, but, it seems like people have it reoccur.
I don't know. I think, if I thought someone had a parvo issue, I would pass on them. Maybe you can call the vet they use, and the trainer -- like ask the breeder you are thinking about using for the names of her veterinarian and her trainer. Give her a day to let them know they can talk about her to prospective buyers. Not sure if they will do this or not. But calling the vet and asking if they bring the puppies in for vaccinations, if they have their dogs vaccinated there, if they have had any issues with parvo... I wouldn't worry over much about giardia.
The trainer may be more willing to talk to you. It could be a friend of the breeder. But he/she should also be a professional. And I bring another puppy in, it will probably have the same fate.
It is nothing to mess around with.
Here's another thing. When people have dogs, it is easy to become overwhelmed. It happens fast. So someone keeps everyone UPT on shots, vet, grooming, etc, and takes dogs to training, and then Bam! Parent goes into the hospital, job loss, husband gets sick, and somehow 5 dogs are acquired in the course of a year, and suddenly, everything starts falling off. The trainer or vet may say wonderful things about someone, but if they haven't been to them in 2-3 years, things may have changed.
Kind of scary. Don't take parvo lightly. If someone does nothing else, they should be getting the rabies, and distemper/parvo shots ever 4-5 years at the largest interval. Most have it done every 3 years. Studies say they last 5-7 years. But they are killers.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.