We have two.
Daisy, an adoption made in the early days of love when Sweetie indulged me my every whim (okay, he still does), and a trip to the Humane Society brought us face to face with an auburn dog who knew that we were supposed to take her home.
Buddy, showed up at our door three summers ago, just three months old and following a Dish Network salesperson around in the 95-degree Nevada summer heat. He took one look at me, and moved in for the kill. We took him to the backyard to get him water and out of the heat and Daisy looked at us as if to say, "A toy! Thanks!"
They are fully entwined in each others hearts and in ours.
This essay by Arthur Phillips poignantly charts how we track our milestones when there is a dog in the home. (Warning: possible hanky alert)