Again, Colloidal Silver for upper respiratory infections. SuperSilverSolutions is a brand that's safe for pets- I don't know about the others. Two tsp three times a day for ten days for cats- a gerbil would be about 3 pounds(???)- so adjust the dosage down to about one tsp three times a day for ten days. Don't use metal with Colloidal Silver - just plastic or glass- so you can give it using an eye dropper.