1.: A salary job. => The job comes with a salary.
2.: A salaried job. => The job is salaried. (A salary is given)

Can you re-explain this to me please? I still don't understand the difference between 'salary' and 'salaried'

Eg. :
1. What does #99 and#100 mean?
2. What do #99 and #100 mean?

3. This is a cat and a dog. (How do I change this to make it look like #2? Like informally #1 is incorrect so I have to use #2 for formal writing.)
4. This is a cat, and this is a dog.