Fun loving and busy, Chihuahuas like nothing better than to be close to their people. They follow them everywhere in the house and ride along in tote bags when their people run errands or go shopping. It's not unusual for Chihuahuas to form a close bond with a single person, and they can become very demanding if they're overindulged.
Besides being affectionate housemates, Chihuahuas are intelligent and fast learners. They can compete in agility and obedience trials with just as much enthusiasm and success as larger dogs. That said, they're willful little dogs. You'll be most successful if you can persuade them that competing — or simply doing as you ask — is fun. Use positive reinforcement in the form of praise and food rewards when training your Chihuahua. He won't respond to harsh treatment.
It's important when considering the Chihuahua to take into account his small size. Chihuahuas are curious and bold explorers. They've escaped from yards through small gaps in the fence and can squeeze into places that other puppies and dogs wouldn't be able to fit. And even though they tend to rule the roost, they can be accidentally injured by rambunctious larger dogs.
Chihuahuas are not recommended for homes with children under the age of eight, simply because of the chance of injury by a young child. Regardless of your family situation, it's important to remember to socialize your Chihuahua to children, adults, and other animals. Chihuahuas are mistrustful of strangers, which makes them good watchdogs, but they need to learn to meet people in a friendly manner. It's also important to remember that Chihuahuas tend to forget they are small and will stand up to a larger aggressive dog; as a result the Chihuahua needs vigilant supervision in new situations, while they're on walks, and when they're in the yard.
The Chihuahua's personality and unique size make him a wonderful go-everywhere companion. People who live with Chihuahuas become devoted to them, and many say that once you share your life with one, there will be no other dog breed for you.