Cat vs dog (or are they the same thing?)

[Chris]

Hi there,
I'm after a new pet, but I can't decide between a cat or a dog?
Can you explain the difference - they both look the same to me?

[magoo]

Good question. Take the creature below for example. Would you classify that as a cat or dog?

[magoo]

But seriously, if you can't tell the difference between a cat and a dog, why not just get a snake and tell everyone it's a rare legless cat-dog cross-breed