A SECRET WEAPON FOR RIDDLE

Q: My pores and skin is environmentally friendly and slippery, I've 4 legs and webbed feet, I hop on land and swim underwater, I really like bugs and little fish to eat. What am I?Problem: Remodel the term "CAT" in to the word "Doggy" by shifting a person letter at a time, with Each individual step leading to a sound English term.Prepared to get th