As per Vedic sciences Hindu philosophy believes in rebirth unless your Sanchit and Prarabdha Karmas are totally exhausted. It also believes in liberation in which once your past karmas debt is over you do not take a rebirth. On the other hand Garuda Purana says that you can be reborn as animals which means you can be born like a donkey or a dog. Vedic science on the other hand says that once you get a human body you will either be liberated or only get another human body. The message of Garuda Purana can be read and interpreted in a different perspective. In mythology humans have been linked to animal tendencies. For example bull is linked to sexual and non sexual desires peacock to vanity etc. Probably people who wrote Garuda Purana meant that if you do not live according to the Shastras you will end up in getting another human body but with animal tendencies and behavior. Disclaimer The views expressed in this write up are my own .