Of course - a Pet Doorbell, why aren't we surprised? Just when you thought "they'd" thought of everything, it appears they hadn't. If you're sick of your dog scratching the heck out of your door trying to get back into the house, then consider this ludicrous but practical alternative. It may also be worth considering the question 'how intelligent is your dog' first. Apparently dogs can easily be trained* to stand on (or press a paw onto) the Pet Doorbell, which will then transmit wirelessly to an inside unit, which will chime or bark to let you know Fido is waiting to be let in. * Wireless * 2 sounds * Water resistant * 50 feet range * Wall mountable * Requires 1 x 9V battery and 3 x AA batteries * Size - paw - 4 x 13 x 4cm * Receiver 13 x 9 x 4cm