Child's Interest of wanting to be Dentist, but the dog?

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Our child wants to be a Dentist and loves brushing her teeth all of the time and helps out younger sibling and is always very proud of her work. One day you go to the bathroom being called in there to find a surprise and go shopping for all new toothbrushes for everyone in the house. Our puppy has wonderful bright teeth, flossed and all! You can't help but laugh but then you ask the magic question "How many times have you brushed the dog's teeth?" Just to find out it's been quite often. And the dog likes it. What have you found your child doing for their future interests that is down out right funny?