There's a good article on Yahoo Sports about it. The article basically talks about how Mayweather is a perfectionist who never gets tired and who works harder than anyone else. The author mentions that Mayweather has been in camp for 4 days and weighs 147 lbs.( keep in mind that the limit for this bout is 152 lbs.) the man who runs Mayweather's gym had this to say; "Did you see that?" Edwards said. "I've been around boxing for many, many years, and I've never seen anything like it. I'm totally serious when I say this, but he's ready to fight tomorrow. "He started on Monday, and it was like he'd been here for six weeks already. I honestly can say that in all my years in boxing, I haven't seen a thing like it."
That is what Floyd is about. He fights in the weight that he is. He doesn't dehydrate himself 10 lbs or more. He lives to train, everyone knows that. Floyd Mayweather sparing session: 15, 5 minute rounds with 5 fighters. Each fighter gets 3 rounds so they are fresh and floyd can test his stamina. We he says "hard work and dedication" he means it.
If you look at the picture from Canelo today, on his birthday. He looks like he's about 155. Thin for him, maybe too thin.