I've always bought the 12 oz. bottle in the past but being I'm a labrador breeder who doesn't over bathe my dogs, I'm going to get the gallon for pricing reasons and not to run out. I was going to purchase 3 bottles of 12 oz.'s. I was trying to decide which one was ther best for my dogs when and if they have even 1 tick.
Why bother with several 12 oz. bottles when the gallon is reasonably priced? Tick and Flea season are in full swing right now so my dogs will be bathed more often with a quality, flea and tick killer. If they don't have any, they won't be bathed. Labs don't need frequent baths. Frontline Plus is not working as well as it should so it's time to find another product.
Good luck and good health to you and your dogs, especially your Labs. ;)