hi im new and was wondering what is the naturally strongest dog breed in terms of pulling weight, carrying weight, etc. also id like to mention that i dont care how well they can fight or how strong thier bite is. that is of no interest to me. im looking to develop a weight training program for powerfull dog breeds that consists of sled pulls, sand bag carries, etc. i just would like to know what dog breed would be optimal to train. also i know some dogs are strong for thier size but im mostly interested in the overall strongest dog that would be best suited for this type of excercise. thx for all opinions in advance.