[Help] is this spot just him blowing his coat?

http://ift.tt/2rWBFBr dark spot on his leg. I just wanted to see if it's because he's finally blowing his coat or not. He hasn't touched it, but I've been getting loose tufts of fur off of his legs, he still isn't blowing his coat on his torso. via /r/dogs http://ift.tt/2qD32fI