Two of my favorite pups, Bear the Shiba Inu and Teddy the Yorkshire Terrier, walked 3 miles in the hot morning sun. They had several water stations for the dogs, as well as one or two for the humans.
The reason I mentioned this is because when I got to the mile 2 marker, I really thought we had walked more. It was really some of the longest 3 miles of my life because I was not really allowed to run. I guess running and walking are two very different animals (pun intended).