Chewy has one enormous expense. Chewy's (CHWY -0.14%) revenue has soared over the past few years, thanks to the e-commerce company's popularity with pet parents. The company sells almost everything they need, from food and toys for their furry friends to medication and pet insurance. Recently, Chewy even expanded its e-commerce shop into Canada, another promising market, and launched its first veterinary clinics in the U.S. All this helped Chewy report almost $3 billion in revenue during the most recent qua ...