There is no animal that has been recorded to be faster than a cheetah because it can run up to 70-75mp so there is not on land or air animal faster than a cheetah

Yes because they have longer legs and can reach more distance in one step than short people

This might be because it isn't familiar with your sent or needs to be closer to you by playing with it

They can and can't because it depends on the sex if its a female no but a male might act aggressive towards the small dog

Well it depends on how old it is. Plus you should check with your doctor

If your dogs nose isn't wet then that means he is sick and should see a doctor.he isn't eating maybe because he dose not like that kind of food so you should probably try variety of different food and a you should by it some snacks and treats.