Are both Jack Russell Terrier and Bullmastiff types of dogs?
Bullmastiff The Bullmastiff is a large-sized breed of domestic dog, with a solid build and a short muzzle. The Bullmastiff shares the characteristics of molosser dogs, and was originally developed by 19th-century gamekeepers to guard estates. The breed's bloodlines are drawn from the English Mastiff and the extinct Old English Bulldog. It was recognized as a purebred dog by the English Kennel Club in 1924. They are quiet dogs and very rarely bark.
Icelandic Sheepdog The Icelandic Sheepdog is a breed of dog of spitz type originating from the dogs brought to Iceland by the Vikings. It is of similar type to the Norwegian Buhund, the Shetland Sheepdog, and the Welsh Corgi. They are commonly used to herd sheep in the Icelandic countryside.