NOT KNOWN DETAILS ABOUT RIDDLES

Q: My pores and skin is green and slippery, I have four legs and webbed toes, I hop on land and swim underwater, I like bugs and tiny fish to take in. What am I?Dilemma: Completely transform the word "CAT" into the word "Pet dog" by modifying a person letter at any given time, with Every stage causing a sound English word.normally takes its viewers