We have a greyhound, and they are closer to cattle than pets at the beginning of their lives. Each dog has a unique combination of numbers tattooed in their ear

We have a greyhound, and they are closer to cattle than pets at the beginning of their lives. Each dog has a unique combination of numbers tattooed in their ears. Then they are named according to a weird convention where litter-mates share a "first name" while having their own unique "second name". For example, my greyhound was named Del Sol Madison, and she had litter mates with names like Del Sol Martin, Del Sol Maxine, etc. These names are used for identifying the dogs, but they are not trained to respond to them because they aren't pets. Once we got her, we called her Maddie and that's just been her name ever since.