Congrats on your rescue. It could be she is overweight, she is used to a lazy lifestyle, the food, etc etc. Because it is so hot (it usually is 100+ F here when we go for walks at night and I see the same thing) the walks and playtime should start off slow. I think eventually the activity level will increase with food and gradually increasing activity time, as well as when it cools off.We just got our 2 year old dog about 4 days ago, We're starting to switch her onto Evo food as the previous owner had her on a no name brand (no meat at all in it), so her energy level is a little bit low. I'm easing her into going for walks as she's not really use to it and gets tired easy. So far were up to 2 short walks a day and then the kids will take her out and run around with her.
Today I took her ball with us during the walk and she only lasted 10 minutes then laid down with exhaustion. We just got back and she's panting a mile a minute. The heat probably isn't helping as its about 35 degrees celcius right now.
Will her energy level get back up with time on the new food? All she seems to want to do is lay down and sleep all day.