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Okay this is a really cute short video clip, but I’m wondering if this is going to be an aggression problem when this chi gets older. What do you think?

No it is not,it is a way of them playing.My Chihuahuas is 5and 10years old.They both have done this since day one.My teacup is worst than my 4pd dearhead Chihuahua.So have fun!
This is my 4pd Chihuahua
They are both really cute Judy!