With Cartel Coin cards, you can get Cartel Coins outside of SWTOR.com and receive an exclusive pet along with it. Starting May 28th 2015, the cards have changed to give out new pets, the Juvenile Rancors, and this guide will tell you all you need to know to get them.
EA is doing a cross promotion right now and offering SWTOR pets for players of other Free to Play games managed by EA. There are 5 pets currently and the claim offer expires on April 1.
SWTOR pets guide with a gallery of all the pets available ingame and their methods of acquisitions. Updated for patch 3.3
A comprehensive guide on getting the SWTOR Taunlet pet and Ice Scrabbler Jerky.
A comprehensive guide to finding unusual eggs in SWTOR and hatching these and mysterious eggs to obtain the Orokeet and Orosquab pets.