dog behavior

[sabu]

my parents have a ten year old half chow and half lab mix.
he has already bitten my mother and father.
he has gotten overly aggresive and I don't know
what to tell them..

[Giselle]

If it's that dire of a situation, find a reputable professional behaviorist, preferably a veterinary behaviorist ASAP.

Board-certified vet behaviorists:
http://dacvb.org/about-us/diplomates/diplomate-directory/

SF SPCA's Dog Training Academy Alumni:
http://www.sfspca.org/academy/referral.shtml

American Veterinary Society of Animal Behavior referral list:
http://www.avsabonline.org/avsabonline/index.php?option=com_dbquery&Itemid=319&task=PrepareQuery&qid=10

Good Luck. If you need more help, tell us your location and we can perform a more detailed search.