Because, let's face it, having a dog is a lifestyle choice.
Initial purchase price of the dog: $100,000
Spaying/Neutering the dog: $50,000 (optional, but highly recommended)
Fur conditioner: $50/month
Food: $100/month (or $200/month if you're fancy)
Vet bills: $50/month (or $1000/month if you're unlucky)
Couch cushion replacement: $1000
Lost sleep: priceless
Estimated total cost of ownership over the course of 10 years: $1.2 million
(Note: This estimate assumes you'll never get tired of your dog and decide to get rid of it, which is highly unlikely.)
Having a dog is like buying a small house with a mortgage that never ends.
Or, you know, just get a house with a yard, a mortgage, and a family of your own. That's a lot cheaper.