Horde only pets

[Jackncoke]

Besides the Argent Champion Tourney area, are there any other horde only pets?

[Cabadath]

Festival lantern
Argent gruntling
Guild page
Guild herald
Horde balloon
Enchanted lantern

As well as some from the pet store (moonkin and hippogryph both come in a horde and an alliance version as far as I can remember).

Not sure if I nailed them all, but there are several faction-specific ones. Start a horde character, buy from the AH, start a horde char to cage pets for selling on that AH to buy horde pets.

Good hunting

[Zerdolf]

Festival lantern
Argent gruntling
Guild page
Guild herald
Horde balloon
Enchanted lantern

As well as some from the pet store (moonkin and hippogryph both come in a horde and an alliance version as far as I can remember).

Not sure if I nailed them all, but there are several faction-specific ones. Start a horde character, buy from the AH, start a horde char to cage pets for selling on that AH to buy horde pets.

Good hunting

Festival Lantern can only be bought from the vendor by Horde during the event but can be learned by an alliance toon if you can get it (neutral AH possibly).
Enchanted Lantern is the same way, can be learned by alliance but is created by a Horde enchanter.

[Zerdolf]

And the Argent Tourney pets are not quite Horde only. They also can be learned by alliance but can only be bought from the vendors by Horde toons.

Easiest thing to do is find someone on here that will do a 5 for 5 trade for them. Otherwise you can level a Horde toon and get them yourself or farm your AH until you find them all.

[Dragonwizard]

There are also a few pets that can only be bought off of Horde only venders but can be learned by Alliance. I just can't remember which ones off the top of my head at the moment.

[Ysabell]

Shore Crawler can only be learned from the trainer by Goblin characters. They can be caged, but you can only learn one per character. This mirrors the Gilnean Raven and Worgen characters.

[Spyro]

There are very few pets that have Faction limitations.

Moonkin Hatchling
Argent Gruntling / Argent Squire
Horde/Alliance Balloons
Guild Pages and Squires - These are the only pets that are bound to individual characters. I believe they are also the only ones that have a summoning cooldown.