Teenagers are all different so there is no one answer to this question. If you visit www.mypyramid.gov, you have the chance to describe the teenager and see what kind of diet he/she needs.
It depends on how much the horse weighs and what kind of food you are offering it. Check out The Horse and Pony Encyclopedia. Or go to your local library and take out some books.
Depends on the cat. Smaller, lighter cats will naturally eat less, whereas a bigger or bulky cat will eat more. That said, a cat will eat far more if fed a lower quality food to get the nutrition it...