I'm not sure how it'd work, but this is my theory:
1. No class restriction, anyone from Tac to Sci can have one.
2. It should be mission based, i.e: acquire a Targ from the KDF kennel or something like that.
3. The Targ would be counted as a revivable pet. If it falls in battle, you revive it like a BOFF. But it would have to be enhanced with extra health to compensate for the lack of armor.
4. It would be a click power, like Neural Blast or something similar.
As an alternative, you could also have a mission to get one of the Gorn Saurs, but you should only be allowed to use Targ or Saur, not both simultaneously.
As for a Federation Equivalent, I'm not sure what we could have.
Tac officers get a security detail, Klingons could get targ's, or the gorn things, and then fed's could get a skinning knife, and after a pvp match add specialized boots to the exchange
Lol - I like this idea.
Seriously though - I would like to see a pet class in the game. I am one of the few that actually enjoy ground combat more than space. Yeah it is a bit dull and broken - but aty least I don't feel I am wiping out the population of a small planet in a single mission by defeating a few dozens ships with several thousand crew onboard each mssion.