The default rarity is the minimum when a pet is learned. For wild pets this is usually "poor". Pets from other sources can be common, uncommon or rare by default.
Source:
Wild Pet
Expansion:
Mists of Pandaria
Owned by:
86.98%
Based on this many collections: 215
Players who own this pet have it:
Once: 37.5%
Twice: 31.25%
Thrice: 31.25%
Strategies:
2
Popularity:
Low
Pageviews:
4998
Breeds:
BB, SS, HP, HS, SB HB
Critter
Critters are immune to stun, root, and sleep effects.
50% vs.
33% vs.
33% vs.
50% vs.
When you have two rabbits, you'll often soon have three.
Source 
PvE 
PvP 
Other Info 
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