My old dog before Spike was a BC/Lab/Staff mix - he was thirteen when I adopted him and seventeen and a bit when he died, and I - well, any individual dog is irreplaceable, but I couldn't be walking around dogless. All I knew for sure was that I wanted an active, intelligent dog that I could do stuff with, an interesting dog that'd keep me busy and give me a reason not to turn myself into a 700lb couchpotato.
I told the shelter I needed a gundog, herding dog or mix thereof under two years old that had to be good with cats - Spike was the first dog they got in who fitted that description and he happened to be a purebred BC. I went to meet him and boom - love at first sight like a lightning bolt.
I'm just lucky he decided to keep me