An adult Jack Russell needs a complete food and a portion based on its real weight: a 6 kg neutered Jack Russell with moderate activity needs about 271 kcal a day. Studies of UK veterinary records add three things most feeding guides miss: pet Jack Russells weigh more than the breed standard on average, they are not a breed predisposed to being overweight, and in one of these studies they had the longest life expectancy of 18 breeds, so they spend many years as seniors.
The FCI breed standard does something unusual for the Jack Russell Terrier: instead of a weight range, it ties weight to height. The ideal height at the withers is 25-30 cm, and weight should be the equivalent of 1 kg for every 5 cm of height, so about 5 kg for a 25 cm dog and 6 kg for a 30 cm dog. The standard adds a hands-on check: the chest just behind the elbows should be easy to span with two hands, a girth of about 40-43 cm.
Pet Jack Russells are heavier on average. Among the 101,294 Jack Russells seen by UK vets in the VetCompass programme in 2019, the median adult weight was 7.9 kg (7.3 kg for females, 8.4 kg for males). How much of that gap is size and how much is extra fat, the study cannot say: it recorded neither height nor body condition, and breed was whatever the practice had on file, with no pedigree checks or DNA tests. A pet 'Jack Russell' may be taller than the standard, closer to the Parson Russell Terrier (a separate breed with an ideal height of 33-36 cm), or a cross.
So the scales alone will not tell you whether your dog is in shape. If yours is within the standard, the 1 kg per 5 cm rule gives you a reference weight; if it is taller, go by body condition: ribs easy to feel but not visible, and a waist you can see from above. That is a score of 4-5 on the WSAVA 9-point scale.
Many feeding guides say yes. The data say no: the Jack Russell does not come out as a breed predisposed to being overweight. In the Royal Veterinary College's VetCompass study of 22,333 dogs seen in 2016, overweight was recorded in 76 of 1,168 Jack Russells, about 6.5%, in line with 7.1% of all dogs. The eight breeds at higher risk were others, such as the Pug, Beagle and Golden Retriever. The authors warn that overweight is underreported in clinical records, so the finding is that Jack Russells are no more prone than other dogs, not that they never get fat.
Two other findings still matter for the bowl. In the same study, neutered dogs, male or female, had about 1.9 times the odds of being overweight compared with entire females. And hypothyroidism, a hormonal disorder that often causes weight gain, is diagnosed less often in Jack Russells than in other dogs: in a study of more than 900,000 dogs they had less than half the odds of crossbreds. If your Jack Russell is putting on weight, let your vet rule out the thyroid, but start by looking at portions and snacks.
The breed's reputation for boundless energy does not automatically mean more calories either. In a meta-analysis of 29 studies on the energy needs of adult dogs, racing dogs needed the most, followed by working and hunting dogs, while pet dogs needed the least. In our quiz, choose high activity only if your Jack Russell actually works or hunts, or does hours of hard exercise every day.
In a study of life tables built from 30,563 UK dogs, the Jack Russell had the highest life expectancy at birth of the 18 breeds analysed: 12.72 years, against 11.23 years for dogs overall, and its tables ran to age 19. It shows in the population too: the median age of Jack Russells seen by UK vets in 2019 was 8.3 years, the second-highest of the 40 most common breeds (crossbreds: 5.4).
In other words, half of the Jack Russells under veterinary care are over 8, the age at which our quiz counts a dog as a senior and lowers the portion, so retake the quiz when yours reaches it. Staying lean through middle age matters: in a study of 50,787 neutered dogs of 12 breeds (the Jack Russell was not among them), dogs that were overweight at 6.5-8.5 years had a shorter median lifespan in every breed; in the Yorkshire Terrier, another small terrier, overweight dogs had a median lifespan of 13.7 years against 16.2 for those in normal condition. Weigh your dog once a month and count rewards within the daily ration: on a 6-8 kg dog, an extra half kilo is already 6-8% of its body weight.
Calcium oxalate stones. In an analysis of more than 124,000 calcium oxalate stones from dogs in the United States, the Jack Russell was one of 12 high-risk breeds, all of them small, with roughly twice the odds against each of three comparison groups. The first stone appeared at around 9 years on average, and four Jack Russell cases in five were males; the authors advise screening high-risk breeds from 5-6 years of age. If your dog has already had oxalate stones, the diet is the vet's call: the ACVIM consensus focuses on more dilute urine and on avoiding diets with excessive protein. Talk to your vet before any change of food, ours included.
Teeth. In the 2016 VetCompass study, periodontal disease was diagnosed in nearly 1 Jack Russell in 5 (213 of 1,190), against 12.5% of dogs overall, with 1.37 times the odds of crossbreds. The WSAVA dental guidelines name tooth brushing as the gold standard and state that standard dry dog food is not beneficial for oral health. On wet food, the studies they cite disagree: in two, moist food behaved like typical dry food on plaque and tartar; in one, soft foods led to more plaque and gingivitis than a more fibrous food. Choose food for other reasons, and brush your dog's teeth.
Every Pappa Fresh recipe contains one meat and lists the percentage of each ingredient on the label, so you always know what your dog is eating and can discuss it with your vet:
They are cooked in the pouch and kept out of the fridge until opened; once opened, keep them in the fridge and use within 2-3 days. For a 6 kg Jack Russell a 400 g pouch lasts about 1.7 days on the Complete plan. If you would rather keep some kibble in the bowl, the Mix plan covers half the daily ration with our recipes. Turkey is poultry: if your dog has reacted to chicken, ask your vet before trying it.
An adult 6 kg Jack Russell, neutered and moderately active, needs about 271 kcal a day: that is roughly 238 g of our Chicken recipe, or 199 g of the richer Beef. An intact dog burns more, about 339 kcal. The chart runs from 5 kg to 7 kg: if your Jack Russell is taller and heavier but in good shape, the quiz calculates the portion for its real weight.
Compared with kibble feeding guides these grams will look like a lot, and that is normal: kibble is far more concentrated (around 350-400 kcal per 100 g, against 110-136 for our recipes), so for the same calories a wet food weighs about three times as much. For the general method, see how much should a dog eat.
| Weight | Energy need (kcal/day) neutered / intact | Grams per day neutered / intact | Complete plan | Mix (½) |
|---|---|---|---|---|
| 5 kg | 236 / 296 | 207 g / 260 g | €3.76/day | €1.89/day |
| 6 kg | 271 / 339 | 238 g / 297 g | €4.41/day | €2.16/day |
| 7 kg | 304 / 380 | 267 g / 333 g | €4.93/day | €2.43/day |
Grams based on the Chicken recipe (114 kcal/100 g); with Beef, which is richer (136 kcal/100 g), you need about 16% less. Prices for a neutered dog.
Figures calculated with the same method as our quiz (FEM×K: maintenance energy adjusted for breed, activity, neutering and body condition). They are an estimate: take the quiz for your dog's exact plan, and talk to your vet about any health concern.
Two minutes: enter weight, age and activity to get the exact portion, with 30% off your first order.
An adult 6 kg Jack Russell, neutered and moderately active, needs about 238 g a day of our Chicken recipe, or 297 g if intact; at 7 kg it is about 267 g. These are estimates: the right portion also depends on your dog's body condition.
About 271 kcal for a 6 kg neutered adult with moderate activity, and about 339 kcal if intact. Seniors, from 8 years in our quiz, need less; a Jack Russell that genuinely works or hunts needs more.
With our recipes, about 238 g of Chicken or 199 g of Beef a day for a 6 kg neutered adult. For any other wet food, divide the daily calories (271 kcal) by the kcal per 100 g on the label and multiply by 100.
Jack Russells seen by UK vets had a median adult weight of 7.9 kg (7.3 kg for females, 8.4 kg for males). The FCI standard asks for less: 25-30 cm at the withers and 1 kg per 5 cm, so about 5-6 kg. The UK study cannot tell taller dogs from overweight ones, so check body condition rather than the number: a score of 4-5 on the WSAVA scale.
No more than their size and activity require. In a meta-analysis of energy studies, pet dogs had the lowest needs, and Jack Russells are not a breed predisposed to overweight in UK vet data. In the same UK data, though, neutered dogs had about 1.9 times the odds of being overweight, so weigh yours regularly.
Written by the Pappa Fresh editorial team from published veterinary studies (see sources). Not a substitute for your vet's advice.
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