I know this topic has been on here repeatedly but I still don't know the answer to this. All the different types and sizes and formulas of worm product are totally confusing.

I have Panacur horse wormer in the tube. It is the 25 gram size or .88 oz. How much of this paste would you give an 80 lb girl? Is it a good idea to worm this girl who I am going to breed? She just came in season today.