Your Chihuahua might be suffering from Small Dog Syndrome. This is behavior based and rooted in lack of training. Chihuahuas are known to be stubborn, but they want to please their owners and earn rewards. If your Chihuahua has small dog syndrome, he will try to appear larger than life to let everyone around him know just how fierce he can be. But when your Chihuahua is not just acting aggressive but also whining, he’s communicating something to you. Chihuahuas will whine when they are uncomfortable. He is vocalizing his anxieties before the aggressions come out in barking or growling. This kind of behavior can occur if your dog is feeling lost and alone or fearful of others in or around your home. Your Chihuahua could also be whining to appease another dog within your home.
Building your Chihuahua’s confidence will help control the amount of whining he does. Obedience training will build your Chihuahua’s skills as well as give you and your guests tools when socializing your Chihuahua. You can also give your Chihuahua purpose by teaching him obedience commands. This gives him jobs to do, even if it’s as simple as sitting before having his meal served, that will build his confidence and place him in the ranks of your pack. If you have other dogs in your home and your Chihuahua is acting submissive by whining, you can place them on closer levels in the pack by treating them the same. Make them work together to earn treats at the same time. If you are carrying your Chihuahua around the house or coddling his fears when he whines but you don’t do that with your other dogs, begin treating them the same with the same rewards for good behavior.
Be prepared to set boundaries with your Chihuahua. This will build confidence and set defined rules. Make your training sessions with your Chihuahua short and rewarding. Bring playtime into training sessions. To encourage your dog to stop whining and bring his confidence to a level where he feels secure, use high-value treats during training. Foods like cheese and hot dogs, cut into small bite-sized pieces, will keep your Chihuahua interested in working on changing this behavior.