[Mina And Lucky]

my yorkie used to love watching my goldfish swim around in his little bowl so one day my little sister put the bowl in front of Lucky to show him up close......then lucky starteed drinking the water and acidenlt bit my goldfish, it died and when he saw it wasnt moving he started whimping and howling and licking it when we went to flush it he waited next to the toilet and wouldnt move. now all he does is stare into the toilet and whimper. i feel so bad and im worried sick becouse he wont eat or drink, i called the vet and he said to just keep an eye on him... hes only 3 months old any advice?