<human>: Condense the text into a few key points

My SO thinks my pup has been getting really tired, very quick. I think it's just from running. 

Lestrade is a 1.5 year old German Shepherd/Malamute who had a THR in February. The surgeon told me I no longer had to restrict her movement in May. 

She goes to the dog park and will run for ~10 minutes, rest, then repeat. She is usually at the park for an hour to an hour and a half before she'll tap her leash by the gate to let me know she wants to go home. 

Now, the dog park on our property does not have water available so she doesn't have anything to drink until we're back home (every time I bring water down there and her dish, someone snags it)

Today we took Lestrade to the city park and she ran around for awhile and we left after 45 minutes. While in the car my SO asked if Lestrade was okay because she was panting heavily. She has a water cup in the car which she drank from as well as from the fountain at the park.

I said she was fine, but now I'm wondering if I'm missing something. Lestrade eats and drinks normally. She used to eat treats immediately, but now she'll take the bone we give her at night and bury in our bed. She's had solid mixed with some soft stool lately. 

We live in Southern California, so it gets hot, but today it's 80F, windy, and cloudy. And I usually take her to the park at night when it's 80 or below. 

I will probably take her to the vet Monday for a check up, but I wanted to see what you guys thought first.
<bot>: my SO thinks my GSD has been more tired and panting more heavily than usual. Not sure if there could be something wrong.