Dosage is 7 mg per kg. Cat weighs 10 lbs which equals 4.53 kgs. How much do I administer in ml's?

You should not have to convert to millilitres. Give what is specified in milligrams. Why do you want to convert and risk the wrong dosage?

You would have to convert to ML if the medication is a liquid.

If it is a liquid, what does it say on the bottle about milliliters per milligrams? It should look something like this, and I'm only pulling numbers out of the air.

5/2 which means 5mg per 2ml. Once I know this I can convert it for you properly.