The Chihuahua bite force pressure in PSI is less than 195 or about 100 PSI, thus Chihuahuas won’t be able to bite off a finger.There may be cases where a Chihuahua may bite into a major vein in one of your fingers and the only way to save your hand is to remove that specific affected finger. Chihuahuas will generally nibble at your heels and cause some bleeding. There hasn’t been a case where a Chihuahua bit off a finger.