Yesterday I went to the World Championship Dog Weight Pull that was going on during Fur Rondy. It was a chilly 15°f, but the dogs were all excited and there was a huge crowd attending.
There wasn't an unhappy dog in the house. The sled weighs 200 lbs empty. Each concrete cylinder weighs 30 lbs. The sled started empty and each heat the weight was increased by 3 cylinder (90 lbs.). I left when the weight got to 560 lbs. Some of the smaller dogs were still kicking but.
These guys and gals love to pull.