Your companion can become invisible to all but you.
Prerequisite: Bonded creature 4th-level
Benefit: Your bonded creature uses the power of its spiritual bond to render itself invisible (as the spell) to all creatures except yourself and those you designate. The bonded creature can use this ability once per day with a duration of 24 hours. In all other ways this acts as a spell-like ability with a caster level equal to your associated class level.