A group of dogs, especially a group of wild or free-roaming dogs, is referred to as a pack. A kennel is a common alternative term for a bunch of dogs.
According to About.com, dogs are pack animals rather than solitary creatures by nature. Wolves belong to the same family as dogs, Canidae, and wolf groups are known as packs. A kennel is also a facility where dogs and other animals are housed and cared for when their owner is unavailable. Many kennels also provide grooming and training services.