Immature For Adults?

have 6 kids (3 boys age 5 years old and 3 girls age 11 months old). My husband came home with a 5 pound, cockapoo dog about a week ago, as a total surprise. I am so busy, but a sucker for animals. The dog is very good with the kids, and so far all the kids have been amazing with the dog. The dog is being really easy to train and at only 3 months old, and 1 week of being in my house, she actually started going to the door when she needs to go to the bathroom. I am still mad that my husband didn’t talk to me though, therefore I’m going to try to get back at him to teach a lesson. It worked out this time perfectly, but who knows what will happen next time he does this? I just bought a new car to fit everyone like 1 month ago. I called the rental place and they said they had a car that they just bought and only had been used twice. I’m going to rent it, and then pull in the driveway pretending I just bought this little 2 seater sports car. Good idea or immature?