Not plausible at all
Service dogs go through several years of training, then a new owner is found and the dog and owner are trained. Most places are run nonprofit and don’t charge for their dogs
yes you are right. my aunt raised service dogs for there first nine months and did the pretraining that would go into the dog before it started its formal training. a lot of time and effort goes into the different types of service dogs. my aunt loved doing it. her job was to expose the dogs to different environments and try to stop in wanted behavior like cat chasing or being scared of loud noises. she raised theses dogs for years and always wanted one of her dogs to not make the cut but she was good at her dog and never got to keep any of them because of failure to train. eventually in her old age she ended up with a service dog that was trained to retrieve dropped items leaned on for support. her medical problem was a degenerative back problem brought on by juvenile polio.