Run Procedure on Mobs I Tame?

I am making a mod that replaces Wolves with Dogs, and I am making it so when you tame a Wolf, it turns into/gets replaced by a Dog.

I would do this by detecting when you tame a Wolf, then spawn a Dog owned by the Player at the location of the Wolf, then despawn the Wolf.

I know how to do the replacing bit, but how you I run a procedure from a mob that you tame?

Any help would be greatly appreciated!