Ok to not use Panacur Powerpacs in your rotation?
We recently moved our horses home and have since taken over worming our guys every 8 weeks as per our vet's instructions. Vet has the 5 day Panacur PowerPac listed to use in April. Our guys are backyard horses, 2 big guys, 2 minis, and are not exposed to other horses on or off the property. Pastures are picked on a regular basis.
Is is always a good idea to use the 5 day Panacur PowerPac once per year or would I be ok using the 1 dose Panacur instead?