u/Ok-Difficulty3131

This is Benny, me and my family got him from a shelter but I have no idea what he’s mixed with. When we got his medical papers, they said he was a border terrier mix which I can see in his face but border terriers grow to 11-15 pounds at full age and when we got him last week he was 9 weeks and 17 pounds. I’m wondering what he’s mixed with and how big is he going to get?