Getting a fussy cat to finish a bowl, or holding a dog's attention in a distracting park, usually comes down to how much the reward smells. Freeze-drying takes the water out and leaves the aroma behind, which is why whole krill work so well as a high-value treat. There is one ingredient in the bag and nothing else, so what draws them in is simply the fish.

Freeze-drying is a slow cold process rather than a bake, and it keeps the krill whole, so they stay light and brittle rather than greasy. That crunch matters at both ends of the bowl: cats tend to accept a dry, snappy texture more readily than an oily one, and dogs can take them straight from the hand without leaving your fingers coated. Crumbled over dinner, the smell carries through the whole bowl.

• Freeze-dried whole krill with nothing added
• Single ingredient, so no fillers, colours or preservatives
• Naturally crunchy and strongly aromatic
• Works as a training reward or as a topper for a fussy eater
• Suitable for both cats and dogs
• Four pack sizes: 40g, 120g, 350g and 500g

Worth knowing before you order. Krill are shellfish, a common trigger for food-sensitive pets, so introduce them slowly if your cat or dog has a history of reacting to anything. These are a treat rather than a meal, so count them into the day's food instead of adding them on top. We do not publish a feeding quantity because the right number depends entirely on the size of the animal eating them.

What the options mean. Sold in sizes from 40g to 500g — £8.99 to £21.99.

Who it's for: Cat and dog owners who want one high-smell, single-ingredient reward that works for training and for tempting a fussy eater.