Rex Smaller Than Expected But Fun

by Mark
(Colorado)

His name is Rex.

Got him from a Colorado Rescue Organization. He is not a purebred GSD.

Right now he weighs 33 lbs and stands 16", When I got him, he weighed 23 lbs.

He eats Nutro dog food. His appetite is good, he eats everything.

He has run of the yards and gets walked.

He is 9 months old and 33 pounds. How big will he end up getting? The rescue does not know what he is mixed with and assumed he would be a regular size German Shepherd, but that's clearly not the case as he is small at 9 months.

What should I expect him to be size wise at adult? Thanks.