Oil is the one supplement almost no animal refuses, which is a real advantage and also the reason it is the easiest one to overdo. Nothing else on this shelf goes down that willingly.

Johnson's produce this from sustainably sourced farmed Atlantic salmon and sell it as an addition to food rather than something given on its own. Their reasoning is the omega-3 fatty acids in it, which they link to skin and coat condition, joint mobility, dry and itchy skin, the immune system and heart health, and they also point it at the growth and development of puppies and kittens. It is a 500ML bottle and it covers dogs and cats from the same container.

• 500ML bottle
• Produced from sustainably sourced farmed Atlantic salmon
• For dogs and cats, and Johnson's name puppies and kittens too
• Added to food rather than given on its own
• Johnson's cite omega-3 fatty acids as the reason for it

What has not been supplied. There is no analysis with this product at all - no omega-3 percentage, no EPA or DHA figure, no calorie content and no daily amount. On an oil that matters more than it would elsewhere, because oil is pure fat: a spoonful over a full bowl is extra calories rather than a free addition, and for a dog on a weight plan it has to be counted rather than added. No storage instruction or shelf life has come through either, and fish oil does go rancid, so go by the date on the bottle and by the smell, and keep the cap on it.

Who it's for: owners of a dog or cat with a dull, flaky or itchy coat who want a straightforward oil to add to meals, and mixed households who would rather buy one bottle than two.