As far as I'm aware, Mend Wounds and it's morphs will not heal allies whilst in werewolf form, despite the animation still showing on characters hands, whilst toggling it on before transforming.
It doesn't say anywhere it won't work whilst in werewolf form, and I am pretty sure this is a bug, unless ZoS thinks that it shouldn't work in werewolf form, even then it should say on the tooltip somewhere.
It doesn't say anywhere it won't work whilst in werewolf form, and I am pretty sure this is a bug, unless ZoS thinks that it shouldn't work in werewolf form, even then it should say on the tooltip somewhere.