Hides and houses
Shelves and ledges
Foraging and toys
Cage accessories
Kits and bundles
Fairy forest
Spooky mischief
Sweetie stash
Game mode
Forest floor
Castles and cathedrals
Your pets’ own page
Add each pet once. We work out their age and life stage, keep a weight log, and make a card to share or a sheet for the vet. Everything stays on this device.
What My Mischief does
My Mischief is a little page of your own for each of your pets. Tell it a name, what kind of animal they are and a birthday, and it works out how old they are today and which life stage they are in. It works for rats, rabbits, guinea pigs, hamsters, mice, gerbils, chinchillas, degus and ferrets.
- Age and life stage. The stages, ages and notes are the same ones in our lifespan guides, so you can read where each one comes from.
- Weight log. Add a weight whenever you weigh them, in grams or ounces, and watch the line.
- Share card. A picture with their name, age and stage, with your own photo if you add one.
- Vet sheet. One printed page with their age, stage and weights, and room for your notes and questions.
- Coming-home certificate. For the fridge, the cage wall or the group chat.
Where your pets' details are kept
On your own device, in this browser, and nowhere else. There is no account, nothing is sent to us, and your photo never leaves your phone or computer. That also means a different phone will not know your pets: use "Save a backup file" on one device and "Load a backup" on the other to carry them across.
How the age is worked out
From the birthday you give, counted to today. If you only know roughly how old they were when they came home, put in years and months and the age will say "about". For rats, the page also shows the rough match in human years from our rat lifespan guide.
Life stages are a guide, not a diagnosis. Animals of the same age can be in quite different shape, and your vet knows yours best. If you need help choosing a vet, start with how to find an exotic vet.