fwiw, Safe-Guard dewormer is the same thing as Panacur (Fenbendazole), which is commonly prescribed for giardia. I know Safe-Guard is available at PetSmart; not sure if it’s available at PetCo or not. The dosage-by-weight on the box is accurate, but the boxes are only a 3-day treatment so you’ll need to buy several. Stick with your vet’s recommendation on length of treatment; my vet was conservative and recommended a 15 day treatment. Believe me, the Safe-Guard is much cheaper than prescription Panacur!