The Weight Log That Catches Problems Early

*Weight is the one health measure you can take at home, for free, in under a minute — and in dogs it changes before almost anything else does. A simple weight log turns a number you would otherwise forget into a pattern that tells you something is wrong, weeks before you would ever see it.*

Your dog looks the same to you every single day. That is exactly the problem. You see her morning and night, and a kilogram lost slowly over two months is invisible to the person who loves her most — but it is obvious on a chart.

Weighing your dog regularly and writing the number down is the most useful health habit an owner can build at home. It costs nothing, takes a minute, and it catches change early: dental pain making chewing uncomfortable, a thyroid problem, kidney disease, a gut condition, or the slow creep of excess weight that quietly shortens a dog's life. Vets treat a loss of more than 10% of body weight, where nothing about the diet or exercise has changed, as clinically significant. For a 20kg Labrador, that is 2kg. Two kilograms is very hard to see by eye. It is impossible to miss in a weight log.

Here is how to build the habit, what to write down, and when a number on the scales means picking up the phone.

Why your dog's weight is the earliest warning sign you have

Dogs are good at carrying on. A dog with a sore tooth still comes for dinner. A dog with early kidney disease still meets you at the door. Behaviour changes late. Weight changes early, because weight sits downstream of almost everything — appetite, absorption, metabolism, pain and mood. And weight is a number, which is much harder to talk yourself out of than an impression.

The risk runs in both directions. Loss is what owners worry about, but gain is the more common welfare problem in Britain: PDSA reports that nearly half of UK dogs are overweight, and excess weight is linked to arthritis, diabetes, breathing difficulty, some cancers, heat intolerance and a shorter life. Neither problem announces itself. Both show up in a log.

Weight on its own is only half the picture, because the right weight for a dog is the weight at which their body condition is right. Pair every weigh-in with a hands-on check, scored on the standard 1–9 body condition scale where 4–5 is ideal. You should be able to feel the ribs easily through a thin covering without pressing, see a waist when you look down from above, and see the belly tuck up when you look from the side. A weight and a score, month after month, is a genuinely useful health record.

An owner running their hands along a dog's ribs to check body condition score.

How often to weigh your dog — and how to get an accurate number

How often depends on life stage:

• Puppies — weekly, while they are growing
• Healthy adult dogs — monthly
• Seniors, from around seven years (five in giant breeds) — every two to four weeks
• Dogs on a weight-management plan or with a diagnosed condition — as your vet advises, often fortnightly

Accuracy matters more than equipment. Weigh on the same scales each time, at roughly the same time of day, ideally before a meal. A small dog can go on bathroom scales the simple way: weigh yourself, weigh yourself holding the dog, subtract. For anything bigger, most UK veterinary practices keep a walk-on scale in reception and are happy for you to use it without an appointment, and many run free nurse-led weight clinics.

Then write it down straight away, before you reach the car park and forget. Record four things:

• The date
• The weight in kilograms, to one decimal place
• The body condition score, 1–9
• One line of context — what she is eating and how much, her exercise that month, anything that felt different

That last line is the one owners skip and later wish they had kept. "Switched to the new food" or "off her breakfast twice this week" is what turns a column of numbers into an explanation.

A dog owner recording their dog's weight at home after a weigh-in.

One weight is a number. Twelve weights are a story.

A single weigh-in tells you almost nothing. The value is entirely in the comparison — and comparison only works if the earlier numbers still exist somewhere you can find them.

This is where most good intentions quietly fail. The weight is read off the scale at the practice, mentioned in passing, and lost. Six months later the question that actually matters — "was she heavier than this last autumn, or is this normal for her?" — has no answer, and everyone starts from scratch.

Guudpet exists for exactly that moment. From the day your dog comes home, you build the record: weights, body condition scores, vaccinations, worming, flea treatment, vet visits and the notes you make along the way. It is yours, it is in one place, and it holds the history your memory will not.

When a weight change means calling the vet

Book an appointment, rather than waiting for the next routine visit, if you see:

• A loss of more than 10% of body weight when you have not changed diet or exercise
• Steady loss across two or three months, even where each individual drop looks small
• Weight coming off while she is eating normally, or eating more — this usually points to a metabolic or digestive cause
• A gain of more than about 5% over a few months that an honest treat audit doesn't explain

Treat it as more urgent when a weight change arrives alongside anything else: increased thirst or urination, vomiting or loose stools, lethargy, a dull or changed coat, bad breath, or reluctance to chew hard food.

Bring the log with you. A vet handed twelve dated weights can see in seconds which direction the problem is moving in and how fast — information that might otherwise take weeks of tests to establish. Most weight changes turn out to have a manageable explanation, and nearly all of them are easier to deal with when they are caught early.

A senior dog being examined by a vet after a change in weight was noticed.

None of this asks you to become a different kind of owner. It is a minute a month: a number, a quick hands-on check, and a single line of context — the sort of small, unglamorous habit that does far more for a dog than any amount of worrying. You will probably never notice the year it works. That is rather the point. The problems it catches are the ones that never get the chance to become serious.

*Paul Stenning • Founder, Guudpet*

*Guudpet provides intelligent care guidance and does not replace professional veterinary care. For specific advice about your animal, always consult a qualified veterinarian.*