Useful piece of kit. maybe sell them with the dog collar(in the case of that particular animal). People can be lazy so this would serve as a bridge to something pet owners are already familiar with buying. Very sad to hear that a pet has died from over-heating.
Hey just off topic for a mo. I have signed up to go to the Birmingham event on the 7th and I see you are going too. Look forwards to seeing you there(I'm just going through the list of people attending and glad to see there are a good few so far)