I have a cheap case from Joanns and have to take huge amount of care, seat belt it, lift it over bumps and stairs...
That said ...
now what exactly is a pet stroller????? Do you put them in diapers or let them out to pee? My poor old yellow lab is so arthritic she can't go for romps any more, barely limps around the yard. Could she fit in a stroller? it would be a blessing for her