You can obtain various pets to accompany you and your companions. These pets provide no tactical advantage, and are not defined as companions.
Brown Womp Weasel
Desert Nekarr Cat
Ivory Mouse Horranth
This pet is available from the Cartel Market.
Kowakian Monkey Lizard
Low Atmosphere Miniprobe
This pet is available through purchase of a Cartel Pack in the Cartel Market.
This pet is provided as part of the collector's edition. Its a variation of the Mouse Droid.
Model Redeemer Starfighter
Slate Mouse Horranth
This pet was provided as part of the Legacy Promotion to all active subscribers during a specific time period during the month of April, 2012.