Lots of people use weight collars. 4lbs does not sound like a lot but for most dogs it is about 10% of their bodyweight. For an average guy that would be a 16-20 pound necklace. I use one but it is more in the 2lb range or closer to 5%.

I don't leave it on the dog just during the work. I know some that do. The theory I guess is that the dog adjusts to being 'heavier' all the time. I am a big believer in rest. When it is time to rest it should be nothing involved but the dog and the rest. Nothing should compete with the rest.

But like most things in the dogs, there are a lot of 'right' ways to do things. S