Read the following premise and answer if the hypothesis is true.
The Mastín Español or Spanish Mastiff, is a giant breed of dog, originating in Spain, originally bred to be a guard dog whose specialized purpose is to be a Livestock guardian dog protecting flocks (and occasionally herds) from wolves and other predators. The Mountain dog type has a heavier coat.
Hypothesis: Spanish Mastiff is a good guard dog. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
Yes.