Step 1 : Introduction to the question "8. What does it mean if someone is as "crooked as a dog's hind leg"?"
...1. They're strange looking 2. They're very clever 3. They're unpredictable 4. They're dishonest If someone is "crooked," it generally means that they are dishonest and are not to be trusted AT ALL. And considering that a dog's hind leg IS fairly crooked, it was a good idea to mix the two together to create this wonderful simile.