There's two types of skills a pet can learn: active and passive. Active skills are things like Growl, Claw, Prowl, Lightning Breath, Screech, etc. Passive skills are things like Great Stamina, Avoidance, Natural Armor, Arcane Resistance, etc. A pet is limited to four active skills at a time, but may know any number of passive skills (limited by training points, of course).
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He already knows growl, claw, bite and prowl - which one would be best to dump for dash or is dash not worth taking?
I'm doing the BGs with my hunter so dash seemed like it'd be pretty good, especially since I'm working WSG right now.
Since you PvP, I'd drop Bite for Dash, but it's up to you. Night Elf's Shadowmeld along with Prowl makes for great fun, especially combined with Aimed Shot... :P
If you were PvE mostly, I'd have said drop Prowl for Dash, since I personally haven't seen much benefit for it except for the occasional Eyes of the Beast scouting mission...