lab/chow suddenly aggressive @ 4

Hey Everyone,
I have had my lab/ chow since she was like 10 weeks. She is now about 8 years old. She was never aggressive until a couple of years ago she started attacking/ cornering my cocker/pom trying to bite her (and had her neck a few times) We had to put down my cocker/pom about 6 months ago (she was old and sick) and my lab/chow has been fine with my toy poodles (6yr and 2yr) - never had really bothered them (her and the 2yr boy poodle battle sometimes- nothing serious- lab/chow usually backs away.. ha) Anyway she is starting to do the aggression with my 6yr. girl poodle. This is mainly around eating time but why all of a sudden? All of my dogs are sweet and never try to take eachothers food or anything? Any thoughts or ideas?? Thanks.
-Tara

are they all one sex?
I have found that if you keep to many dogs of the same sex under one room they end up getting testy of one another..
I have four female dogs living with eachother right now.. and my three females do not get along with my moms female great dane.. Its a real shame that this happens..We got the great done when she was 3 months old, and our husky was 6.. The Great dane grew up with the husky, and all of a sudden at 2 years old the great dane attacked the husky for no reason and now they have been enemys ever since..

Maybe try feeding your dogs in serperate rooms?

Two of my three dogs have/had issues with food. I've come to the conclusion that no matter how submissive the dog is or how friendly they are, food is just a totally different matter in the dog-dog world. For that reason, my dogs eat in separate rooms and my puppy even eats in a closed crate.

Just separate them during feeding time, and you should be fine :)