We see this a lot, dogs going to multiple trainers for even the most basic issues, like walking on a leash and they still can't do it after MANY classes, how are you going to stop resource guarding, aggression, anxiety, jumping, counter surfing, nuicance barking? Walking a dog is a pretty easy thing to accomplish for 99% of the dogs.
Be careful about all of the false info, memes,& catchy slogans, like "don't train with pain" I see many dog owners in pain since they can't stop the unwanted behavior.