SAN FRANCISCO--(BUSINESS WIRE)--Whistle, the leader in pet health and location tracking, today announced the launch of its newest pet wearable -- The Whistle Switch Smart Collar. Whistle Switch offers 24/7 GPS location monitoring, so owners always know where their pets are. Additionally, total health and fitness monitoring helps pet parents understand what is normal so they are empowered to provide the best care and be the best pet parent. To take it a step further, the collar offers a new, sle