Make sure you understand the breed to provide the proper enrichment to fulfill your pup's needs. A lot of problem behaviors (not all of them) tend to stem from lack of enrichment. Look into puzzle feeders, stuffed kongs, chewables, lick mats, etc. Search for your trainer's credentials - don't just hire anyone. The dog training industry is unregulated, so there are a lot of trainers with no actual education on canine behavior and have outdated methods.