My first puppy ever! Meet Buddy!

He's 4 months old and 26 pounds. Owner said hes Anatolian, kelpie and great Pyrenees mix? I'm hoping for some insight on how big he will get. If the paws give it away, he has some large feet.

I have been struggling with house training. Most of the time he does real good but lately he doesn't empty his bladder all the way. But he knew how to fetch right away!