Page History

...

Each row (animal) in the CSV data file must have an externalID.  The externalID should be a unique value that is used every time that specific unique pet is uploaded to us.  The externalID is used by our import system to match up the animals in your data file to the animals that have already been uploaded to our system.  We recommend that you develop your own unique ID methods, such as 17050301 for the year, month, day, and the consectutive number consecutive number of animals in intake, 01 for the first animal of the day, or F1939 for the 1939th feline in your org, and so forth,

...