i just want to clarify and explain that a dog stroller can be really useful in some situations.
for small dogs and senior dogs or sick dogs. they still like to walk, but sometimes, they suddenly do not want to walk anymore and you can put them in the stroller and continue walking if your other dog still want to walk, or go home with the dogs in the stroller. i have seen people walk older dogs and push an empty stroller along for that exact purpose.
when it rains, some dogs will refuse to walk, but maybe you still want to get out of the house with them. sometimes milu doesn't want to walk just because the ground is still wet.
in some malls dogs are allowed as long as they are in a purse or a stroller.
if you ever dine out with your dog, it's really nice to be able to put them in the stroller and eat at the outside area of the restaurant with them. (if you put them in your lap, they will beg for food, and i don't want to put them on the floor for safety reasons)
dogs should walk around because most dogs really enjoy it, but strollers can still be really handy.
strollers are really helpful for people with multiple dogs or medium size dogs.
so anyways, i think strollers are very useful and not silly at all!