Happened onto this tool by chance while browsing the Wowhead forums. I’ve not seen anybody mention this and it can be quite useful for serious pet battlers… okay, okay, an oxymoron really, since pet battles aren’t really “serious”, let’s just say anybody who cares about getting the best pets possible.
The better quality a pet is (from poor to rare), the harder it hits and the higher its stats. This is known. However, two identical pets of the same quality can have different stat spreads, depending on their “breed”. Certain pets can only come in one breed, others have multiple – so you might have, for instance, a speedy chicken or a tanky chicken or a stabby chicken.
This is where this battle pet breeds website comes in. It shows you the stat multipliers associated with each breed and, if you input your character and server name, examines your list, tells you the breed of each of your pets, and alerts you to any duplicates (pets that have the same family and breed, and as such are functionally identical if they’re the same quality).
The information used by the website is grabbed directly from Blizzard through the Armory API, so it’s reliable.
Now, what breed a certain pet is might or might not make a difference (I have a blue Minfernal, and I don’t know what breed it is, I’ve not looked, but it was hard enough to track down that even if it’s the absolute worst breed I don’t care), but knowing is better than not knowing, no? And it might make a difference when choosing whether or not to level a rare pet for battling with.