We always had dogs, cats, horses, cattle, birds, fish, rats, mice, guinea pigs, etc. The dogs were family members as was one cat. We were seeing retirement on the horizon when we lost our last dog. We knew we did not want the commitment, especially since we would be fulltiming. That was 20 years ago. Our feelings have not changed. If we need a pet fix we see the neighbors.
If you don't want the dog....don't get one. You will all regret it. If your wife wants one...suggest she volunteer at a shelter.
DO NOT FEEL GUILTY !!!!!!