Dogs love to have purpose. And NO it does not harm the dog. Sure you wouldn't want to "overload" the wagon. But I can see this would be good for someone who needs assistance with things they have to carry. Also good to point out to watch out for over heating. Over heating can happen during any activity. Love seeing well trained dogs.
Do you really know what you are doing there? This is a master peace of shit! Save as much money you could to make your dog´s bones ill. Greetings from Germany, i can´t believe what i see...;-(
This man may be considerate of his animals, but I hate the idea that people watch videos like this and really mistreat their animals by over working them. If there is not that much weight, why not pull your own cart? If there is a lot of weight, the animal shouldn't be pulling it anyway. Just my opinion. Not fair when the animal has no voice in the matter.