Reference These

...When contemplating adding a new animal member to your family.  "For as long as you all shall live" can be a long time, so spend some time making sure it's a happy life for your existing family and your new family pet.  These articles are especially helpful if you have 2 - legged children.

HSUS article:  Choosing the right pet....
ASPCA article: Pets as Presents (and more)
Dumb Friends Animal League: Kids and pets