The following four kinds of small animals report the number of puppies, kittens, rabbits and piglets in turn. Please choose who reported the number below: 15 years old, 2 1.

18÷4=4…2, so 18 is the second number in the fifth cycle, which was reported by the puppy; 28÷4=7, so 28 is the last number of the seventh cycle, which was reported by Lamb. 37÷4=9… 1, so 37 is 10 periodic 1 number, which was reported by the kitten. So, the answer is: puppy; Mutton; Kitten.