THE BASIC PRINCIPLES OF RIDDLE

Q: I weaken all Males for several hours day after day. I show you Odd visions while you're absent. I just take you by evening, by working day get you back again. None endure to have me, but do from my absence. What am I?Problem: Renovate the phrase "CAT" into the term "DOG" by modifying a person letter at a time, with Each and every step leading to