Both ours go out every day in their trailer, a Croozer Dog towed behind a Cube e-bike, it's amazing how much extra wear and tear the rear tyre and brake pads get when towing 50kgs.....
Ours both love their trailer and when we go camping we take the wheels off it and they often sleep in it out of choice.
We weren't sure at first how useful a dog trailer would be and why would a fit dog even need one, but i can say that since we bought one 3 yrs ago that ours has now done around 3500km with the dogs in, i even rode them up La Planche des Belles Filles last year before stage 6 of the TDF (yep cheated, was on the e-bike as bits of it were super steep and had already rode it that morning once)