My vote would be for the last one (AT3). That's the one I wanted to get but due to finances, it's going to have to wait.
I did the research on the strollers, and the AT3 is the one with the biggest interior, so it'll be good if you plan on getting more dogs. 3 big wheels is also better than 4 little ones if you ever need to stroll it off the trails through a park.
I'm a firm believer to always buy the best you can afford so you won't have to upgrade later.
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