Do we allow this for spectral hounds as well, or are those "off-limits" since they're from Dragon?
Since the spectral hound information isn't necessary to use the feat, I see no problem with mentioning them. Perhaps in a format like this?
Gith Hound Bond [Psionic]
You have formed a special bond with a gith hound.
Prerequisite: Manifester level 5th.
Benefit: Your bonded gith hound gains the following abilities based upon your manifester level as if it were a psicrystal: Alertness, improved evasion,
share powers, telepathic link, deliver touch powers, power resistance, and channel power. Additionally, the bonded gith hound may store up to 5 power points for its master as if it were a congizance crystal.
Special: A creature bonded with a gith hound may not gain a psicrystal, nor may a creature possessing a psicrystal bond with a gith hound.
Note: If you have access to Polyhedron Magazine #100, this feat can be expanded to include the spectral hound.