AD&D

Priest spellLevel 1

Invisibility to Animals

School
Alteration
Sphere
Animal
Range
Touch
Components
S / M
Duration
1 turn + 1 rd./level
Casting time
4
Area of effect
1 creature/level
None
Source
PHB

Flavor

The warded creature becomes imperceptible to ordinary animals, passing among beasts unnoticed.

Mechanics

For 1 + 1 / the touched creature cannot be detected (seen, smelled, heard) by normal animals (not giant/magical/intelligent ones), which behave as if it isn't there unless it attacks. Useful to pass through wildlife/guard beasts. : a bit of fur and the holy symbol.