It’s not always about size. The Chihuahua is one tiny dog with a big dog attitude. While it can weigh no more than 6 pounds, a Chihuahua’s alert nature can make it one feisty little watchdog. Out of all the little dogs, this one is probably the fiercest.
Without training, this little thing is capable of ruling your household, and according to The American Kennel Club, can be, “a little Napoleon.” when left undisciplined. Be wary when kids are around, smaller dogs do not take kindly to the playfulness of young children and can feel very threatened.
59. Boston Terrier
While the Boston Terrier is essentially a playful dog, it is still highly protective. It is that "eager to please" approach that makes them actually rather aggressive and territorial when needed. Bred initially for fighting, these dogs only later became companion dogs.
Early training is essential as they can very quickly get out of hand. Their edginess can turn into a nasty aggressiveness if not disciplined properly.
60. Bernese Mountain Dog
These working dogs were brought to Switzerland about 2000 years ago by the Romans for the purpose of guarding large mountainous terrain, so it seems only natural that these dogs should have quite a bit of fight in them.
Like any worker dog, this breeds is fiercely loyal and will attack intruders with zero hesitation. Best for farms and larger suburban areas, these dogs need a lot of roaming area.
61. Berger Picard
Left to their own devices, these dogs can be highly destructive creatures. They are tall and strong animals that can take down a thread pretty easily.
Ideal for active owners, their agility, robustness and endless energy can be put to excellent use. If idle, these dogs are less pleasant to be around.
62. Lhasa Apsos
It might be impossible to believe but these dogs were originally bred to be indoor monastery-sentinel dogs by Tibetan Buddhist monks. Yes, these tiny dogs are not scared off easily. If these dogs are left untrained, they can turn into aggressive little monsters.
Highly suspicious towards strangers, they are eager to express their dissatisfaction with their owners. They can also very stubborn and have been seen to lie flat on the floor without moving when they are not in the mood for walking.