From the WoW community site forums (http://forums.worldofwarcraft.com/thread.aspx?fn=wow-general&t=804644):

Soothe Animal
- Casting time was increased to 1.5 seconds.
- Monsters would not agro players when they resisted the spell. This has been fixed.

Read the full post, and discuss this here (http://wow.forums.thedruidsgrove.org/showthread.php?t=8311).