Why do you suppose doors are so fascinating and exciting to dogs, particularly Chihuahuas? Think about a door from your Chi’s point of view:
Training
What is the number one behavior problem you have with your Chihuahua? Many will say that it is their Chihuahua’s jealousy of their partner or spouse, even their children.
How to help your Chihuahua to overcome his fear of new people, places, dogs, or new situations. Watch video demonstration.
Chihuahuas can be protective and and can be perceived as aggressive. Does playing tug with your Chihuahua make him more aggressive?