It is really hard to decide what stroller to get. We have a few threads about it. I was going through the same thing. What you need to do it make a list. . . . I know but I am a list maker. What are you using it for. If you are just using it for events, street walks, uneven ground or even jogging. That is important. Then look at the features. I wanted air filled tires, a tether, a tall height I also wanted a metal bar to hold up the basket. I found a few that did what I wanted.
It is really hard to decide what stroller to get. We have a few threads about it. I was going through the same thing. What you need to do it make a list. . . . I know but I am a list maker. What are you using it for. If you are just using it for events, street walks, uneven ground or even jogging. That is important. Then look at the features. I wanted air filled tires, a tether, a tall height I also wanted a metal bar to hold up the basket. And storage. We go to street faires. lol I found a few that did what I wanted.
Pet Strollers : Promenade? Pet Stroller 
Amazon.com: Guardian Gear Sprinter EXT II... Dogger? -The SUV of Dog Strollers
They all range in price. We have some wonderful people here that sell them too Kristin (Maximo ) and Shinja (LilSis)
I also looked at how it is made. I would rather spend once for a good one then after a year or two have to get a new one. I hope I did not confuse you more. But I just went through the same thing and looked at tons of them. My DBF was put through the agony over it .lol He was the one that told me make sure you get a well made one. Just because he is a pup doesn't mean that you shouldn't have a well made one. You will be happier that you did then buying one and not being totally happy with it and have to get another one within a year.
Good luck with your search. Post which did you end up choosing.