the the Dog Repeller

Ultrasonic Pest Repellers use fluctuating high-frequency sound waves to repel pests; No poisons, chemicals, or traps, and no effect on humans or non-rodent pets. Just plug this unobtrusive electronic pest control device directly into an unobstructed household outlet and it works continuously to rid your home of rodents and certain insects. 
The Ultrasonic Pest Repeller is ideal for small rooms (up to 500 sq. Ft. ), such as the bedroom, den, kitchen, laundry room, etc. (For larger rooms, use two Ultrasonic Pest Repellers, one on each side of the room. ) EPA registered. Noticeable level of effectiveness is reached after 2-3 weeks of using this electronic pest control device. You get three Ultrasonic Pest Repellers.

Benefits of the Ultrasonic Pest Repellers:

Pest control without traps or chemicals 
Each ultrasonic pest repeller provides effective single-room protection 
Ultrasonic pest repeller won't affect people or non-rodent pets 
Electronic pest control device covers 500 sq. Ft. 
Easy operation. Just plug into any standard wall outlet