More math

I was putting Leo down tonight after we had been at Vicki's house. I was trying to get him to lie down and calm down so I asked him how many pets Joylin had. He replied 2 - for the two dogs. I said what about the hermit crabs, and he said 2. I said and the kitty cat? He said, she has 2 dogs, 2 hermit crabs, and 1 kitty cat. I asked how many that was altogether and without missing a beat, he said 5. I was so proud and surprised - I nearly fell off the bed.