Hardware for building sensor networks is becoming much more affordable and easier to use for everyday applications. Sensor networks are being utilised for everything from HVAC systems to tracking and monitoring the mechanical health of train cars. For the purpose of this talk we have chosen to demonstrate the power of sensor networks by building a pet monitoring system for the future. Our pets are near and dear to us; we want them protected and healthy. The goal is to give an overview of sensor networks and how they can be applied in various industries, and in particular, as in this case study, pet protection. How do we build the network, what technology is available and architecture design issues will be addressed. Android plays a critical part and will be the glue for the system (control and data visualisation). We hope you will gain insight into the potential of sensor networks when combined with the Android OS.