Is he on track to be a giant?

I'm concerned I either have a giant Sheltie or a small collie! Thurston is only 6 months ( rough estimation) and is up to 40lbs. He's about 16-18 inches tall - also a rough estimation.

I'm having issues with him jumping but I can't seem to get through to him to stop.

Seriously! Are you sure you have a Sheltie? That is huge for 6 months!
 
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