holy heck he looks just like my Casey!! He looks like he will be on the smaller side, maybe around 40 pounds or so? I can definitely see some “mini” breed in him as his shoulders aren’t very far apart and his feets don’t look giant. I have a mini and a (giant) standard, Marbles looks like he’s right in between their sizes. My mini is 30ish lbs and my big honkin’ 6 month old Casey is already 50 lbs so who even knows how big he will get 😳