I believe people are born with the propensity to love animals, or not. I don't think it really matters if you have pets or not growing up.

I loved all animals, especially dogs, from the time I was a toddler. We had one dog when I was a child, but that's all. My mom said when I was a little girl, we would go to her friends houses to visit new moms and babies when they were born. She expected me to be ga-ga over the new baby, like she was. Apparently, I could have cared less and didn't even want to look at the baby. But, I would always ask the mom, "Do you have any pets? Do you have a dog? Can I pet her?"

As soon as I grew up and moved out, I got every species of animals sold in the pet trade, at one time or another. Now, I only have dogs again, but I have eight of them! I also know people who grew up in a house full of all kinds of animals, and as adults said, "Yuck. No way I'm having all those animals in my house like my parents did!"