The maths, with your numbers
No guesswork and no brand chart. This is the same calculation a vet does on paper, so you can check it.
What this means for the bowl
Purina Pro Plan Medium and Large Adult 7+ Age Defence Chicken is one of the more calorie-dense dry dog foods we track: at 3,860 kcal per kg it has more energy than 76% of the 46 dry dog foods in our list. You will pour less of it than you might expect.
To show how much the food matters: a 18 kg spayed or neutered dog needs about 979 kcal a day. That is 254 g of this food, but 237 g of Purina Pro Plan Small and Mini Puppy Healthy Start Chicken and 298 g of Bakers Meaty Meals Chicken. Same dog, same day, very different scoops.
Senior recipes are made for older dogs, who often move less. If yours sleeps most of the day, choose the “Couch dog” setting and check the weight every few weeks.
Purina Pro Plan Medium and Large Adult 7+ Age Defence Chicken feeding chart
Daily amounts for healthy adult dogs with no treats, from the label calories and the AAHA 2021 energy factors. Split the amount into meals.
| Weight | Couch dog | Spayed or neutered | Very active |
|---|---|---|---|
| 2 kg | 37 g | 49 g | 61 g |
| 5 kg | 73 g | 97 g | 121 g |
| 10 kg | 122 g | 163 g | 204 g |
| 15 kg | 166 g | 221 g | 276 g |
| 20 kg | 206 g | 274 g | 343 g |
| 25 kg | 243 g | 324 g | 406 g |
| 30 kg | 279 g | 372 g | 465 g |
| 35 kg | 313 g | 418 g | 522 g |
| 40 kg | 346 g | 462 g | 577 g |
| 45 kg | 378 g | 504 g | 630 g |
Label values: 3,860 kcal per kg. Source: purina.co.uk, checked 18 Oct 2026.
Questions
How much Purina Pro Plan Medium and Large Adult 7+ Age Defence Chicken should I feed a 25 kg dog?
About 324 g a day for a spayed or neutered dog, before treats. That is 1,252 kcal a day divided by the food’s label value. Use the calculator above to adjust for your pet.
How many calories are in Purina Pro Plan Medium and Large Adult 7+ Age Defence Chicken?
The label states 3,860 kcal per kg (checked 18 Oct 2026). Recipes change, so check your bag.