The one supplement that we all need for our health, including our pets, is omega 3 fatty acids. For our dogs and cats, being carnivores, the best and most easily absorbed oil to get that from is fish oil. One of the best fish oil sources is herring oil and we've had great results with this brand, this is straight out of the fish, prior to any processing. The squirt top makes feeding multiple animals a breeze, no more cutting capsules open! We are assured by the manufacturer that very little heat is used to extract this human grade of oil so no damage is done. The furkids really love it, which also helps! New 1 Liter size for a great low price makes keeping your pet healthy and happy a lot less expensive! This bottle has a 1 year shelf life.