Useful tools, no account required
Dog Tools
Understand your dog’s age and keep useful changes in one place. Every tool is free and works in your browser.


Scientific Dog Age Calculator
See your dog’s life stage and human age range using breed and size.
Dog Weight Tracker
Save repeat measurements and see the change on one clear timeline.
Senior Dog Health Tracker
Keep dated notes about eating, movement, sleep, orientation and comfort.
Which tool fits your question
Start with the dog age calculator when you want context for where your dog sits in life. Size and breed change how quickly dogs move through life stages, so a seven year old small dog and a seven year old giant breed are rarely in the same place.
Use the weight tracker when you want to see a direction rather than a single number. One weigh in tells you very little. Four or five spread over a few months show whether the line is steady, drifting up, or drifting down, which is the part worth mentioning at a checkup.
Use the senior tracker when the useful information is a pattern instead of a number. Dated notes about eating, movement, sleep, orientation and comfort turn a vague sense that something has shifted into something you can actually show someone.
The tools work well together. Bring the age range for context, the weight line for direction, and the dated notes for detail. You can print any result or email it to yourself, and nothing leaves your browser until you choose to send it.
See the result first
Every result and history is visible without entering an email address.
Private by default
Tracker entries stay in this browser unless you choose to email a report.
Clear limits
These tools organize estimates and observations. They do not diagnose or replace veterinary care.