A diet log fails in two opposite ways: weighing so often that water, meals and a full bladder masquerade as progress or disaster, and weighing so rarely that a stalled diet runs for months before anyone notices. The middle path is a rhythm set with your veterinarian, entries recorded in identical fields, and food written down with the honesty the whole exercise depends on. The log does not run the diet. It reports on it, faithfully, so the professional guiding the diet can steer.
Cadence: Agreed With the Vet, Commonly Every Couple of Weeks
Ask your veterinarian how often to weigh and write the answer at the top of the log. For many dieting dogs that rhythm is every couple of weeks: close enough together that a genuine trend appears within two or three entries, far enough apart that the change between visits exceeds daily fluctuation. Daily weighing invites emotional decisions based on noise, and monthly weighing can hide a plateau for a quarter of a year. Keep the appointment rhythm and the home rhythm in step, so a review visit lands on a weigh-in day with fresh numbers. If your veterinarian wants a different interval for a puppy, a senior dog or a medical case, their interval wins; cadence on a diet is a clinical detail, not a household preference.
Same Scale, Same Conditions, Every Time
Choose one scale and stay with it, ideally the practice walk-on scale or one home scale used consistently, at a similar time of day, before a meal where possible. Record the conditions inside the notes field when they vary, such as a wet coat or a weigh-in straight after a long drink, so a strange point carries its own explanation. Weigh a small dog by holding them on a bathroom scale and subtracting your own weight, repeating once to confirm the reading settles at the same figure. A point taken on holiday on an unfamiliar scale should be marked as such rather than silently blended into the series, because trend lines built from mixed equipment wobble for reasons that have nothing to do with the dog.
The Five Fields, Filled In Honestly
Use this exact set of fields at every entry: date, weight, food and amounts as fed, treats, notes. Food and amounts as fed means measured quantities of what actually went into the bowl, including toppers, chews with calories and the gravy from your own plate if that is reality. Treats gets its own field precisely because treats are where diets quietly leak: training rewards, the biscuit from a neighbour, the crusts at the cafe. Notes holds appetite, energy, scavenging incidents and anything your veterinarian asked you to watch. A worked entry reads: date 4 April, weight 24.6 kg, food and amounts as fed 180 g dry food split across two meals plus half a carrot, treats three small training treats and one dental chew, notes hungry in the evening and raided the recycling once. That entry can be discussed; "doing fine" cannot.
The Target and the Rate Belong to the Vet
Notice what the log deliberately omits: a target weight column filled in by you, and a promised rate of loss. Your veterinarian sets both, based on body condition, frame, muscle and health screening, and reviews them as the diet progresses. Your role is accurate reporting and steady feeding to the plan, not adjusting amounts between visits because one weigh-in disappointed you. Bring the log to each review, ask whether the trend matches the expected rate, and record any plan change inside the notes field on the day it is agreed. Pet Passport in KinsLe keeps each review entry stored next to the agreed feeding plan for the next check.