A Jack Russell's log measures energy spent, not just food eaten
Most daily logs start with the food bowl. A Jack Russell Terrier's should start with the outlets: what did he dig, chase, solve, learn and patrol today? His appetite, weight and evening behaviour all flow from that column, because a Russell who has burned his considerable drive settles, eats normally and sleeps, while one who has been rained in all day will eat from boredom, bounce off the furniture and shred something educational. Recording the outlets beside the meals is what makes a terrier's log explain itself, rather than merely describing a mysteriously restless dog and a mysterious weight gain in the same month.
The daily Russell entry: outlets, food, behaviour
Under outlets, log walks, garden time, games, training and any work he was given, with rough lengths. Under food, record measured meals, appetite, and training treats, which in a terrier doing daily trick and recall work can add up to a hidden second meal. Under behaviour, note evening settling, digging targets, reactivity on walks and sleep quality. Add teeth and legs as the week goes: Russells are hardy, but they are also acrobats, and a dog who lands oddly from the sofa and favours a leg for an evening deserves a dated line even if he seems fine by morning.
Weighing a small, dense terrier
Weigh a Jack Russell every two weeks on the same scales, and use your hands as well: ribs felt under a light covering, a defined waist, no padding gathering over the hips. Terriers are dense and wiry, so weight, not looks, is the honest measure, and in a dog this size a gain that would be nothing on a retriever is a real change in load on his legs and heart. Compare the number with the outlets column: gains usually arrive with quiet weeks and unlogged treats, and the log lets you restore the balance with activity and measuring rather than with guesswork diets.
Russell changes worth raising with the vet
Contact your vet if a Jack Russell's famous appetite deserts him for more than a day, if he loses weight despite eating, or if a leg he favoured after a jump is still not right the next day. Repeated limping, stiffness after rest in an older terrier, sudden reluctance to jump into the car, and behaviour that flips from bold to withdrawn are dated entries worth appointments. Because Russells push through discomfort at speed, the log's small early notes are often the only record that anything changed at all, so write them the day they happen.
Sharing the Russell workload across his people
A terrier this energetic usually has several people in his day: a morning walker, a lunch-time garden supervisor, an evening trainer. If each holds their own count of walks and treats, he gets too much of both or not enough of either. KinsLe Care Teams puts his feeding, walks and training sessions into one shared record where named people take the duties and mark each one done with a timestamp, so his daily log reflects the whole crew's work, not one tired memory at bedtime.