The boxer is a very high-energy dog, making it a great choice for a family with kids, especially older and very active ones. While not as large a dog as some of the others on this list, this medium-sized mutt is a powerful protecting machine in the face of danger. And when you consider that the boxer is also wonderfully affectionate, it makes this animal a great choice for family guard dog.
If you're considering the boxer as a pet, you'll be pleased to know that this is a highly intelligent and easily trained breed. But you should also keep in mind that the boxer has a tendency to jump on his loved ones, making it a somewhat less-than-perfect choice for families with small children. On the other hand, this habit can be managed with proper training.
Whether you're planning to adopt a boxer or any dog, be sure to do a thorough investigation of the breeder and his commitment to breeding for sound temperament. Fear and anxiety is not a good quality in any pet, guard dog or not.