[Harvey-Specter]

Smaller dogs don't need as long usually. They have shorter legs so it's more of a workout for them to walk around the block than it is for larger dogs. Just think about how many times their little legs have to step to keep up with one of your steps. Obviously there is some breed variance as well.

I have two German Shepherd dogs. They're getting older (9.5 years) but we've found that their ideal is two 45 minute walks. My partner takes them for a 45 minute walk in the morning and I take them for a 45 minute walk in the afternoon when I get home from work. We're fortunate to have a large backyard as well, so I also throw the ball for them after the afternoon walk until they lay down in the grass and don't want to play anymore.