My dentist recommended Oxyfresh mouth wash to me and we feel it is the best mouth rinse we've ever used. My only complaint is that it is a bit pricey.
I have used the pump through 3 gallons of Oral Hygiene for my pets! The alternative is to lift the gallon jug and put 1 tsp into their bowls. You may be stronger than I am but that 1 tsp will be closer to 1 cup in the end. I'd rather spend a little bit for the pump knowing it will last through a couple of gallons and my pets will get what they need, not 10X's that amount!
I've used gallon pump for years with my gallon mouth wash. It makes it easy to refill the smaller container!