Why is my 1 1/2 year old female chihuahua so skittish around other puppies?? We are good friends with the family that gave her to us and we go visit at least once a month. Sometimes our visits will land after her mom has given birth to a new batch of puppies. If i bring a puppy (her sibling) near her, she will try to run away as if its going to hurt her! she really cant stand it, and this behavior goes on until they have almost reached their adult height. would this skittishness make her a bad mother if she were to have a litter of her own, or would maternal instinct kick in with her own pups? (now dont all u againt-backyard-breeders get ur backs up, i dont want to breed my dog) i have never seen this peculiar behavior before, does anyone have an explanation? Thank You in advance for any info u may provide.