Ehem, here comes the Devil's advocate. Maybe it is too hot for the pets to walk?
Just kidding. Well, then they shouldnt be out either, right? And yes, with pets, sometimes I feel it is only one extreme or the other.
I have a neighbor who is single and childless. She has 3 of those black and brown furry thinghies that look like moving and barking tupees when then fall on the floor. They have to be "walked" in a pram daily, which means taken for a ride on the MRT, or else they won't be at peace... and no one else will have peace.
I bought a small one to take either Toto or Bobby -they both do not fit- to the specialist cardiologist vet, as it is a long way -more than 30 minutes on the MRT- and they are more comfortable if they can lie down. It is also safer, and easier to carry a long way, plus the drivers/MRT employees won't scold at you. If I take my pets in a taxi -not often, it is like 300 one way to the vet-, in a pet carrier, most taxi drivers are not happy about it. If I use a doggie purse, it is only for short distances, as standing for a long time in a single position makes my doggies unconfortable.