Just a side note regarding Quest. I will not use it again. I have used it in the past with no problem thankfully.. however -
A friend of mine's vet dosed my friends horses with Quest. The problem one gelding had, and was proven to be from the Quest was everywhere he had white hair/pink skin, (he's a bay) the hair fell out and his skin sluffed off.
Extensive testing proved moxidectin was the culprit, and Ft Dodge settled with my friend out of court admitting it was the fault of their product