is my dog greedy or has worms?

by SHIRLEY CUST
(N IRELAND)

I HAVE A YEAR OLD DOG AND LATELY THERE IS NO FILLING HIM. I WORMED HIM BUT IT DOESN'T MAKE A DIFFERENCE. IF YOU FEED HIM AND LET HIM OUT WHEN HE COMES IN AGAIN HE IS STRAIGHT TO HIS BOWL AGAIN. IF THERE IS ANYTHING LEFT HE WILL EAT IT. I GET REALLY MAD BECAUSE HE IS FED WELL AND I SOMETIMES THINK HE IS JUST GREEDY