I have heard of people saying the wheels and zipper broke on the stroller I have, but I've been using mine steadily for a year without a problem. It really is very useful to have, it keeps her from getting stepped on, off hot pavement, and gives her more space (and less body heat) than being carried.
Lola loves being in it too, if I bring it in the house she begs to get in. It took some training to get her used to being zipped in though.
If it broke I
might invest in a better one, since I use it a lot, but it really is a good stroller. The only people I'd say it's a bad stroller for are people who jog.
Here's a picture of the back
New Classic Fashion BestPet 4 Wheel Blue Pet Dog Cat Stroller w Free Raincover | eBay
With the bed and blanket in the bottom Lola is lifted up enough to lay down and press her face against the mesh lol.
This is the bed I put in the bottom, to give you an idea, I got it very cheap last year with a sale and coupon.
Grreat Choice® Plush Bolster Mat Dog Bed | Beds | PetSmart