Our shelter uses pea gravel for our outdoor play yards and walking trails for all of our dogs-puppies included. It works fine for the most part but it can be difficult for dogs that have a hard time maintaining their balance and it can be unstable and painful for dogs with hip and leg injuries to not be on solid ground. We have thought about using crushed limestone but we have very severe weather for most of the year and it would need costly yearly maintenance and it can get messy when out dogs are playing extra hard. There are turf options specifically made for dogs (it's easy to clean and has proper drainage) but it is incredibly expensive. More information about a turf option can be found here. All this being said, I don't know what the best option is, I hope others have input as well!
------------------------------
Bailey Evans
Grant Writer
Animal Allies Humane Society
MN
------------------------------