Many classes have the equivalent to the warrior’s Taunt (e.g., Provoke) that can be used to make pets attack you. Why would you do this? One, it will help keep pets off of your healer. Two, having a pet attack you can break you out of many CCs.

Here’s the macro I use for Shield Slam on my protection warrior:

/cast [@arenapet1] Taunt
/cast [@arenapet2] Taunt
/cast [@arenapet3] Taunt
/cast [@arenapet4] Taunt
/cast [@arenapet5] Taunt
/cast Shield Slam