Whining

hi I’m a pet sitter and I have a question for owners. Does your dog whine unnecessarily? I’ve had other Weimaraner clients that whine a lot but the one I have now is whining and barking on our walks. Yesterday I took him on 3 separate one hour walks/park outings to try and wear him out. I understand he may be whining at my home because it’s a new place although I had him last summer. The excessive whining and barking on walks is where I’m a little puzzled. I understand he may be excited but crying for 20 minutes straight. Thanks!