I admit it: I let my dog sleep on my bed. She loves the size and plush feel of my queen-sized mattress, but it sometimes makes it hard to get her comfortable and happy in her own dog bed. Over the years, I’ve had to rotate through a number of beds for my 6-year-old havanese and bichon frise mix, Bella, and I’ve struggled to find ones that fit her criteria. Bella’s picky: She gravitates toward fluffy, plush beds over harder, more rigid ones. But she’s also a heavy chewer, so any beds…