Anaerobic vs aerobic...I love my Colby carpet mill. Good to built muscle, burn fat, and cardio in short intervals. I built my dogs up to run 10 mins everyday just to keep them fit. Colby wrote a 28day keep with just a carpet mill. Pretty interesting. Carpet mills def has it's benefits.

I am looking to add an basic gambler mill (self assembled) just to get the longer aerobic exercise and lung capacity. Both have their benefits and you can supplement exercises if you have one or the other.

Regardless of what you have the dogs love it!!