Bought this for our two 12 year old dogs who were starting to show symptoms of arthritis (not wanting to go out on walks, lagging behind on walks, slower going up steps, occasional lameness). The pump is really useful for easily measuring dosage (which goes by weight of dog in kilos) and ensures the oil goes exactly where it's meant to and not all over the bottle. The oil smells good and the dogs definitely love it because their bowls are licked shiny clean. Best of all though, they are both like new dogs! Full of energy, no hesitation whatsoever about going out on walks (even when it's really cold) and their coats look great. We use this in conjunction with Blackstrap Molasses and Cortaflex - a 3 pronged approach! As it's from wild Alaskan salmon I think it's probably superior in quality to other oils on the market which are made from farmed norwegian/scottish salmon. Definitely worth giving this a try if your dog is suffering from mobility problems.