991K accounts from PetFlow (petflow.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In December 2017, the pet care delivery service PetFlow suffered a data breach which consequently appeared for sale on a dark web marketplace. Almost 1M accounts were impacted and exposed email addresses and passwords stored as unsalted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)