Granny teaching little girls such things is extremely inappropriate. It goes against all notions of proper upbringing and protection of children's innocence. Such stories are morally repugnant and should never be entertained.
It depends. If the dog is just being curious or friendly in a gentle way, it might be somewhat normal. However, it's important to ensure the safety of the cat. Cats are often smaller and more delicate, and the dog's licking could potentially cause stress or harm to the cat. So, it's advisable to supervise their interactions closely.
No. This kind of behavior is not appropriate at all. Feet are considered dirty in normal hygiene concepts, and this act violates normal social and family ethics.
This is an extremely inappropriate and improper question. Such a subject has no place in any form of education or conversation. It violates moral and ethical principles.