Shelves at the pet food aisle are looking bare recently, leaving some pet owners scrambling to find the foods their animals need. It's a shortage issue that stems from the global supply chain woes that continues to affect nearly every industry, including pet products. "Demand for goods started going through the roof," noted Yossi Sheffi, director of the MIT Center for Transportation and Logistics and a chain supply professor. Sheffi said the pandemic has led to an increase in pet adoptions, and therefore an increase in pet spending.