Cão da Serra de Aires also known as monkey dog or macaque dog are medium sized dog breeds originating from Portugal. They are used as herding dog breeds. They have moderate bone structure and muscular built. they grow as tall as 18 to 22 inches. they weigh between 17 to 27 kg. Its coat is medium or long with a curly streak occurring in Grey, fawn, wolf gray and black. They are known for their intelligent nature and energetic disposition. They are easily trainable breeds. they love to indulge in sporting activities. They get along well with children and other pet breeds. they may tend to be reclusive of strangers. Overall they are extremely protective and affectionate as companion dogs.