Shared Fury( Races of the Wild, p. 152)
Your fearsome rage spurs your animal companion to greater heights.
Handle Animal 4 ranks, animal companion class feature, rage class feature,
When you rage, your animal companion gains the same BENEFITS: and penalties from your rage that you do, but only if it is within 5 feet of you. The companion's rage ends when your rage ends, or as soon as you are no longer within 5 feet of your companion.