DBut wrote:
I have talked to the pet trainer in Stormwind and didn't see it
Jarduce is correct, only cats can learn prowl. It's also a skill that you won't learn from the pet trainer but, rather, something that must be learned from various cat mobs around Azeroth.
Check out Petopia for the list of mobs that have this skill upon taming.
http://petopia.brashendeavors.net/html/skills/skills_prowl.shtml