If Pets Had Thumbs Day is celebrated on March 03, 2017. On this day you should think about what would happen if your pet has thumbs? What would it do? Would it open its own food and open doors or refrigerators on its own?
Many non-human animals also have some kind of opposable thumb or toe. An animal species is said to have opposable thumbs if the thumb is capable of bending in such a way that it can touch all the other digits on the hand or foot. Most species do not have opposable thumbs. Opposable thumbs are a signature feature of the primate family, and played a large role in the ancient humans' invention and use of tools.
In humans, the distal pads are wider than in other primates. The distal pad of the human thumb is divided into a proximal and a distal compartment, the former more deformable than the latter, which allows the thumb pad to mold around an object. (With material from: Wikipedia)