15 Facts About The Mastiff Post author By everyonelovesdogsadmin Post date August 7, 2016 No Comments on 15 Facts About The Mastiff Argentinean Mastiff They are very good guard dogs. They react suspiciously to unknown people. Otherwise they are very playful and loyal to their master. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ← 15 Exotic Pets You Could Own Today → Top 37 smartest dog breeds in the world Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.