Dogs and people express their devotion to each other in ways the recipient probably wishes they wouldn’t: jumping up and piddling with joy (dogs); making gifts of pup-sized Sox jerseys (people). A trip to the groomer’s might fall into that latter category, too—strangers! clippers! yikes!—but not at DogSpa. Rescued from closing in 2006 and thoroughly overhauled by a longtime customer, this previous Best of Boston winner mixes state-of-the-art equipment like an air-purification system and massaging-jet baths with good old TLC. And since there’s tons of doggy accessories here, four-legged friends can emerge not only clean and sweet-smelling, but also togged out like Big Papi.