I am sorry to hear about your Sister's dog. I do understand how she feels as we lost our 18 month old Jack Russell dog due to a tragic car accident too a week ago.
My husband, my son and I are in so much pain that we haven't been able to eat or sleep properly ever since our Lily died. However, I just thank God for giving us the best 18 months of our lives as Lilly filled us with so much joy.