Mend Bones

[Crom]

For some reason you are able to cast this on any npc you target, not just your pet ?

[Dolalin]

Does it work to heal the mob or does it just land but not do anything?

[Daldaen]

Mend Bones should work to heal any friendly Undead. Whether that be your pet, a group mates pet or a charmed undead NPC.

It does not work on enemy NPCs or other players or summoned non-undead pets.

This is functioning correctly.

[Crom]

guess then it's not a bug