Only as much as your Vet prescribes.
My vet says that you should give one milligram per pound. So for a 30 pound dog, 30 mg.
Is the dog mature now? or a pup? Mature dog at 10 lbs eats less, i'd guess at 1/2 cup of food or 1/4 cup two times a day http://www.vetinfo.com/dencyclopedia/deindex.html
990mg for a dog 110lbs. IE:9mg per LB. of animal weight.
5mg 2x day but check with your vet first