I aim to create a system of lost and found pets. The user enters the picture of animal he lost, and if someone finds it, he or she enters its picture in our system and if it is the same animal, we'll inform both the parties. The main issue is that i don't know what computer vision approach can be used for this purpose. I tried searching on internet but everything is trained for human faces. How can i extract pictures from a cat's face and match them with another picture