I recently found out about Eyenimal the through an article over on the Guardian website. It is a super lightweight camera designed to be attached to pet's collars and record their activity throughout the day.
They sell over 1000 units each month which shows that there is a high demand for this kind of pet-related gadgetry. I think this gives some extra credibility to my pet gps service that I want to design.
Here is their demo reel showing the kind of footage the product can capture:
