Growing up I had dogs, lots of dogs (one at a time though), cats (usually only 1 or 2 at a time, but once we had 4), fish (gold fish, mollies, betas, minnows in a bucket from fishing trips with my dad), hamsters (3?), lizards, hermit crabs, and a squirrel for a few days that my mom rescued from a dog.
We currently have a dog, a cat, and a snake. Oh, and chickens. So, yeah, I will allow my son to have pets. :)
ETA: I also had 3 parakeets. Forgot about those jerks.
ETA (again): I also forgot about my rabbits. I had lots of rabbits. Probably 7 total. 3 at one time. Hmmm...wonder if I'm forgetting any others. Maybe a turtle or 2.