Spells to Control Animals

The core spell String of the Unwilling Marionette allows for controlling human targets and there is no core spell to do the same to animals. In the Rego Animal guidelines the level 5 will paralyze an animal, 10 makes an animal passive, and 15 will allow commands to be issues and followed. Similar but not the same. Although it is not RAW I think a level 10 base is reasonable to control the major movements of an animal.

Leash for the Unwilling Puppet

Rego Animal 30, R: Voice, D: Concentration, T: Individual

The caster concentrates to control the movements of the target animal, including walking, running, or moving in place. If the animal tries to resist the movements appear jerky. This spell affects creatures up to size +4.

(Base 10, +2 Voice, +1 Concentration, +1 increase target size)

Leash for the Unwilling Herd

Rego Animal 40, R: Voice, D: Concentration, T: Group

The caster concentrates to control the movements of a group on animals, who must all be controlled in the same way. Movement includes walking, running, or moving in place. If the animals try to resist the movements appear jerky. This spell affects creatures up to size +4.

(Base 10, +2 Voice, +1 Concentration, +2 Group, +1 increase target size)

This and many other new spells for Ars Magica can be found here.