I have seen 65lbs in Virginia and that is a big dog. I don't believe the 104lbs, is it possible, I doubt it. Is it probable, not a chance. There are several problems with this; We know there have been many confirmed kills in the east of 50-60lbs coyotes, so 65-70lbs is possible on a fat one. But an additional 30-40lbs, no way, that is a huge amount of weight for a dog as lightly boned as a coyote to carry, much less function with. In order for a canine to change in size so quickly, some other larger canine blood must be introduced, and then reintroduced, again and again. It is incredible genetically, that the 35-45lb dogs out west have morphed in to 50-60lbs dogs in the east this quickly without any outside help. I hope I never see the coyote grow into a 104lb preditor, your labs and hounds would be what is for dinner, and to be honest, I think all of us would be in danger. I hunt them at night, and to be honest, I have had enough of them @ 50lbs sneak up on me, I don't want one @ 100lbs to do it!