It’s no secret that many cats are homebodies, which is why taking them anywhere — whether it be on a road trip, on an airplane, or simply to the vet’s office — can quickly become a stressful event.

Q:Do plug-in and spray pheromone products for cats, such as Comfort Zone, really work? Exactly how do they work, and can they have an adverse effect? A: When a cat is happy or feeling affectionate, ...