Strictly speaking I suppose we have just the one at the moment, a corn snake that we bought for our son about thirteen years ago that has somehow migrated here permanently. However, we do 'dog share' with our sons. We bought a rescue dog for our younger son and he lived with us for his first four months or so before gradually moving to our son's home; he's like a child of divorce with two homes as we have him very often when our son works away or is on holiday. We also regularly dog sit for our older son when he and his wife go away. In fact I'm whiling away the the time on GN now as I'm waiting for him to be dropped off. Our two sons are very close and spend a lot of time together so their two (Labrador) dogs just love being in each other's company. When we have them together (which we often do) they're very playful and whichever one leaves first we always feel sad for the other who looks very woeful to see his buddy go.
We have always had pets and I think they are wonderful teaching aids for children. Over the years, in addition to the snake, we've had a dog, six cats, rabbits, gerbils, hamsters, guinea pigs, a bearded dragon, goldfish, koi carp and other pond fish. Our children have mostly been reliable in looking after their pets and as adults three have dogs and one has a cat. I have little doubt that in the future my cat owning child will also get a dog.