Yes, any time and as often as you like. The tag opens your pet's page online, so you never need a new tag to change what it shows.
How
- Go to My pets and open your pet.
- Make your changes on the Pet tab: photos, name, breed, medical notes, vet and more.
- Tap Continue. That saves your changes and takes you to the Owner tab.
- Check your contacts there and tap Continue again. You'll then see a preview of their page.
The next person to scan the tag sees the new details.