Magic Fang, Greater

(Player's Handbook v.3.5, page 250, DnD 3.5)

Transmutation

Level: ; Druid 3; Ranger 3; Death Master 3; Urban Druid 3; , Dragon 3, ; , Scalykind 3
Components:
Range: Close (25 ft. + 5 ft./2 levels)
Target: One living creature
Duration: 1 hour/level

This spell functions like magic fang, except that the enhancement bonus on attack and damage rolls is +1 per four caster levels (maximum +5).
Alternatively, you may imbue all of the creature's natural weapons with a +1 enhancement bonus (regardless of your caster level).
Greater magic fang can be made permanent with a permanency spell.