What you'll need:
-A computer with a word processing program
-An old USB drive (weatherproof is preferable)
I'm sure I'm not the first one to think of this idea, but I figured I might as well post a quick Instructable on it. Here's what I did:
Create a new Word file with the name of your pet and fill in all of their basic info. The info I included was his name, breed, colour, eye colour, age, microchip number, and the fact that he is vaccinated against rabies.
Then add your basic personal information:
I put my first and last name, contact number, email address and home address. If you're uncomfortable leaving your home telephone number and address, you could always use your work address and number instead.
Then just PDF it and throw it on your old USB drive and clip it onto your dog's collar. That's all there is to it!