From the department of weird crap we do to our pets comes the Float-a-Pet, an illuminated inflatable collar with “smart sensor and locative technology.” Concept is: your dog falls overboard into the ocean/lake/river/pool/whatever body of water, and the collar inflates. It has a humidity sensor that triggers a compressed carbon dioxide cartridge.
From the manufacturer:
The collar serves to support two main situations. First, the passive system is used to recognize where your pet is located at night. The flexible solar cells gather the suns energy during the day and store it in small rechargeable batteries. A light sensor recognizes low light conditions and triggers LEDs to illuminate the collar. Second, the active system is used in disaster relief situations. For example: In the event of a hurricane or the act of simply slipping into a pool. The Collar has a clipped on CO2 cartridge designed to break away. When the integrated humidity sensor reaches its threshold, it is activated. It dispenses CO2 and inflates the collar into a float. The passive solar system will support the floatation device at night by blinking intermittently to get one's attention.
Two thoughts: (1) Does this contraption make it easier for sharks to locate and eat your pet out in the open ocean? And (2) Does it work for cats?