Daughter wants me to stop walking her dog to allow training

[exboyfil]

My adult daughter has a 7-8 month old mini-Aussie that I spend considerable time with (I play and walk with him in the morning from 30 minutes to an hour and a half, I walk him again usually after work for another hour, and then a night time walk of at least a half hour before bed).

He is become a substitute for my old collie mix that died about four years ago. I went into depression when he died, started eating badly, and stopped exercising. I gained considerable weight and had early onset diabetes.

I have been on keto for about a year and a half and lost over 160 pounds. I have been walking a neighbor's dog for a year which I continue to do (used to be up to two hours a day but he seems happier at about 40 minutes to an hour now given his age).

The reason my daughter wants me to stop walking him is because he barks and lunges at other dogs, my daughters are working on a training method that involves no more walks for now (they are getting input from a trainer).

I have to admit that I am pretty depressed right now, and I think we are going to have behavioral issues with the dog when he doesn't get his walks. Her dog so her decision.