Pet Weight Tracker: Log Weigh-Ins and Check Body Condition
Log your pet's weight, see the trend and percentage change, and get a warning if the drop is large. Add more than one pet and check body condition on the 9-point scale.
- Saves in your browser and works for more than one pet
- Flags a drop of more than 10% from the highest logged weight
- Body condition check with an ideal-weight estimate
⚖Weight log
Pick a pet, add today's weight and read the trend.
Your log stays in this browser only. Clearing site data removes it, so download the CSV now and then.
Your result
How it works
How to use the pet weight tracker
- Press New pet, enter a name, species and the unit you weigh in (pounds or kilograms).
- Add a weigh-in with the date and weight. Weigh on the same scale, at a similar time of day, before a meal if you can.
- Read the headline number, the change since the last weigh-in and the chart. Alerts appear when the change is large.
- Score body condition from 1 to 9 using the guide below. The tracker uses it to estimate an ideal weight for overweight pets.
For small pets, weigh yourself on a bathroom scale while holding the pet, subtract your own weight, and use the same method every time. A kitchen scale is better for kittens, rabbits and birds.
What counts as a significant change
When a weight change is worth a vet visit
VCA Animal Hospitals describes weight loss of more than 10% of normal body weight as clinically significant, excluding loss from fluid or dehydration. For a 10 lb cat that is more than 1 lb. Vetstreet applies the same benchmark to dogs and cats, and notes that unplanned loss should be investigated even if your pet seems well. The tracker compares the latest weigh-in with the highest weight you have logged, since that is a practical stand-in for normal weight.
Body condition score
A 9-point body condition guide
| Score | Band | What you see and feel |
|---|---|---|
| 1 to 3 | Too thin | Ribs, spine and hip bones easy to see, no fat to feel. See your vet. |
| 4 to 5 | Ideal | Ribs easy to feel under a thin fat cover; waist visible from above; belly tucked up from the side. For dogs 4 or 5 is ideal; for cats 5. |
| 6 to 7 | Above ideal | Ribs hard to feel; waist faint or absent; fat over the spine and base of the tail. |
| 8 to 9 | Obese | Ribs buried under heavy fat; no waist; belly may hang or swell. |
Descriptions are our summary of the standard 9-point scale (Laflamme 1997, as reproduced by veterinary nutrition teams). The ideal ranges match the Merck Veterinary Manual.
The University of Guelph's veterinary nutrition team puts each point above 5 at an additional 10 to 15% body fat. Body fat is not the same as body weight, so the ideal-weight range in the tracker is an approximation. Weight alone cannot tell you whether a pet is lean or heavy; a small dog and a large dog can both be ideal at very different weights. That is why the tracker avoids breed charts and uses your pet's own trend.
Make it count
Pair weight with food and growth
Weight and food go together: our food calculator turns daily calories into cups, and the puppy weight calculator shows where a growing puppy should be. For the bigger picture, read our pet weight management guide.
From Reddit
What owners ask on Reddit
Quotes are copied word for word from public Reddit threads. They are single people's accounts, not evidence, and we use them only to show the questions the tool is meant to answer.
“Took my golden (7F) in for her annual checkup. Vet weighed her at 81 lbs and got really serious.”
r/OpenDogTraining, Feb 2026, an owner told their dog was overweight · Reddit thread
Our take. A single weigh-in feels like a verdict. A log turns it into a trend, and the body condition check below the chart gives a second opinion from the same scale vets use. Ask your vet for a target weight and a body condition score, and write both down.
“I've had "they need to be a bit chunky" and "I would want to see some rips" vets.”
r/labrador, Apr 2026, an owner who disagreed with a vet's overweight call · Reddit thread
Our take. Vets and owners do disagree on what looks right. The 1 to 9 body condition scale is the tie-breaker: 4 to 5 is the ideal range AAHA uses. Feel for the ribs and look for a waist, log the weight, and bring the trend to the vet.
Questions
Frequently asked questions
How often should I weigh my pet?
What is a healthy weight for my dog or cat?
How much weight loss is too much?
Does the tracker work for more than one pet?
Where is my data stored?
Can I use it for rabbits or birds?
Keep going
More tools for your pet
Read next
Related guides
Sources
Where the numbers come from
- VCA Animal Hospitals, Why is my cat losing weight? — more than 10% of normal body weight is clinically significant
- University of Guelph OVC Pet Nutrition, Scoring for Health (2021, updated 2025) — each point above 5 is an additional 10 to 15% body fat
- Vetstreet, unexplained weight loss in cats and dogs — same 10% benchmark applied to dogs
- Merck Veterinary Manual, body condition score scales for dogs and cats — ideal on the 9-point scale: 4 to 5 for dogs, 5 for cats
- Laflamme D., Development and validation of a body condition score system for dogs, Canine Practice 25(5-6), 1997 — origin of the 9-point scale
The tracker is for general information and does not replace veterinary advice. Last reviewed October 2026.