It’s no secret. Too many animals are abandoned and put down every day. People buy or adopt a dog, only to later abandon them later. While some dogs get a happy ending and find a happier home, not all dogs are so lucky. Photographer Yun-Fei Tou sought to raise awareness for this issue. He photographed these dogs, who were abandoned and put down, through his photo series Memento Mori. Here are some of the most heartbreaking photos, taken of these dogs moments before death:

This Pup

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This innocent looking dog was put down only two minutes after this photo was taken. What tears us up is how this pup is looking right at you. And yet he doesn’t know what’s going to happen to him in just a matter of moments.