I have had the good fortune of owning dogs in the past, mainly Labrador Retrievers.
And although, sometime, I do miss the companionship, I would not have another pet again.
It is not because of the vast amounts of money involved in keeping pets, it is because of not having to go through the pain, upset and sadness of when the time comes for them to be put to sleep because of terminal sickness, or pass away of old age or accidents.
Some of my kids even now, years after the last dog sadly died, do give me, from time to time, framed prints of chocolate labradors as birthday presents, especially if they do resemble my favourite one.
My "Enya" was one in a billion, I would never be able to get another like her, and trying to do that, in my mind, would insult her memory.