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:
Drop
Expansion:
Battle for Azeroth
Owned by:
19.54%
Based on this many collections: 35891
Players who own this pet have it:
Once: 92.87%
Twice: 5.18%
Thrice: 1.95%
Strategies:
4
Popularity:
Low
Pageviews:
5416
Breeds:
PP
Magic
Magic pets cannot be dealt more than 35% of their maximum health in one attack.
50% vs.
33% vs.
33% vs.
50% vs.
Where did it come from, where does it go? Where did you come from, creepy tentacle?
Source 
PvE 
PvP 
Other Info 
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