Hi ! . . I did a lot of research on the strollers before I went out and bought one. I checked reviews and spoken to a number of people. Bought first the Dogger. It is an amazing stroller. It has air filled tires and also shock absorbers. I also have the Pet gear NV it is also a great stroller. I would say these are the top two strollers. I saw the Guardian Gear one. I like the Pet Gear NV much better. Also check Dr fosters they are one of the cheapest for the Pet Gear. And sometimes they even have a coupon for 10% off too. Oh and the pet gear one comes with a handy little pump for the tires
it is a great investment. You buy a better one and it lasts a lifetime
Good luck and let me know which one you get . . .