Shields 1
When the Space battle step starts, if Hound's Tooth doesn't have a Pilot, Hound's Tooth gets the Pilot abilities of one of your Pilots in the Character arena until end of turn.
Hound's Tooth may gain the Pilot abilities of any Pilot in your Character arena no matter what unit subtype the Pilot is allowed to Pilot.
Hound's Tooth gains Pilot abilities exactly as written. For example, in the case of Wedge Antilles (B), the Tooth gains +20 speed, +2 power, Accuracy 1, and gets "When this Speeder would be damaged, prevent 2 of that damage." However, since the Tooth is a Transport, Wedge's last ability will do nothing (unless of course some other card modified the Tooth to gain the Speeder subtype).
Nien Nunb (A) still grants his piloting bonuses to Hound's Tooth despite there being no extra pilot.