Pulse oximetry is great, but know its limitations | Vet Times
Amazon.com : WENSUIJIA Veterinary Handheld Pulse oximeter Blood Oxygen Saturation Tongue Probe for Animal Pets (Include Dogs and Cats) with Bluetooth : Pet Supplies
Amazon.com: UTP02VT 3.5" Touchscreen Veterinary/Vet Pulse Oximeter with Y-Clips Ear/Tongue Probe for SPO2, Pulse Rate, RESP of Dogs Cats Horses : Pet Supplies