These gentle giants make amazing pups, people! Be prepared for big love, big slobber, big eats, big poops, & melting hearts! Mastiffs make great companions as they always want to be wherever their owners are. Hollywood literally follows me from room to room all over the apartment. Although they are huge indoors, they are super lazy and basically form a rug wherever they can carve out a spot underfoot. At the park, he has seemingly boundless energy! Running all over the place and sniffing all the butts! Mine is three and a half, and yet people still think he's a puppy when they see him galloping about.