It had a dragon that has a slave canine. The canine gets some thing that controls the dragon..

what gender they were?

dragon canine comic <- anyways you can look from there. if its not there, then its deleted or badly tagged

They were both guys

M/M anthro wolf/dragon doujin? Overweight dragon? Sounds familiar. Might've had some mind control in it, but I can't remember for sure.

Let's see...

pool #3214, it's been taken down by the artists' request.

https://u18chan.com/board/u18chan/gc/topic/1051705

It's still at the original source though.