Sirus is wearing socks

I had found a tenis court to let Sirus play in. it seemed a good idea, it was fully fenced in and big enough to throw the ball far. Well today he played for something like 7 minutes and then he wanted to go home so I loaded him and corky into the truck and took them back to the rv. Sirus got in and layed down. I was concerned that he tired out so fast but he seemed ok. I headed to the store and when I got back I let them out to potty before I went to get ken. Sirus was limping, stumbling and falling. I took him right to the vet and they found he had hurt the pads on his feet, so he now has bandaged feet and is on some medication. I feel just aweful. I never even considered that the ground in the court might be rough enough to sand his feet that bad. When I looked at him his nails were sanded right down. I feel like a bad mommy. He is bouncing around right now because the pills are killing the pain for him so its hard to keep him settled right now. I need to find a nice safe grass field to play in. I just cant wait till we get to the new house. October 10th is the move in day if all goes well.