I recently had a feeling (could be wrong) between 2 builds the hellhound was drawing less aggro which I could not explain. So I did some test:
If the hellhound only had ember claw , I counted the claw particle effect 14 times in 30 seconds on the dummy, but when infernal breath ability was added it dropped to 9 times in 30 seconds
the attack speed was +58% and cast speed +47%
I am not sure if this actually matters tho since I don’t know if the taunt effect has a certain duration that can overlap with itself?