This could be really useful. It just keeps going through my head how much my dogs bark when the regular doorbell goes off. I can just see them hitting this mat, hearing it ring and going into frenzies.
I found this new product on Petgadgets.com.
Wireless Doorbell for Pets (No Training Needed)
When your pet steps on the mat, the chime lets you know your pet is ready to come in or go out. Easy-to-follow directions are included. No training of your pet is required. After time your pet realizes the fastest way in or out is to step on the Pet door bell Mat — no matter where it may be.
This unit has 12 selectable chimes with Visual Flashing Light, uses a wireless transmitter to transmit to the attractive chime unit which has a range of 100 feet. Signal passes through doors, walls and floors.