Outsourcing of picking up after our pets is also popular, judging by the proliferation of pooper-scooper chains including Pet Butler and the frankly named Wholly Crap, which serves Ohio and Pennsylvania.

FORBES: Why One Recession-Proof Industry Just Keeps Growing

These product categories, sold at chains such as Best Buy and Sears, which were the fourth and fifth retailers most threatened by showrooming, respectively, but less vulnerable than the home furnishings, pet supply and toy chains, according to the Placed survey.

FORBES: Why Bed Bath And Beyond, PetSmart Should Fear Showrooming More Than Best Buy

There are now more than 35 major chains in this niche, from doggy day cares, groomers, and dog-walking providers to pet stores, dog trainers, and boarding services.

FORBES: Why One Recession-Proof Industry Just Keeps Growing