The Bernese Mountain Dog (German: Berner Sennenhund) is a large-sized breed of dog, one of the four breeds of Sennenhund-type dogs from the Swiss Alps. Bred from crosses of Mastiffs and guard-type breeds, Bernese Mountain Dogs were brought to Switzerland by the Romans 2,000 years ago. A full ring would not meet type standard. The AKC breed standard lists, as disqualifications, blue eye color, and any ground color other than black. A Pennsylvania state law states that humans are free to kill animals attacking domestic animals. The AKC breed standard lists, as disqualifications, blue eye color, and any ground color other than black. A Pennsylvania state law states that humans are free to kill animals attacking domestic animals. The man feared a possible attack on his sheep, who were in their fenced off grazing area. Attacks on a neighbor's farm had taken place and resulted in the death of several animals sometime the previous year, although the type of dog who attacked those animals was not a Bernese.