I'm so sorry your dad went down hill. But, working for a Hospice myself (Odyssey HealthCare) it is the best gift you could have given to your dad. I don't believe in giving up but I do believe in hospice when there is no alternative. I know if the hospice you have is anything like the one I work for, he is getting the best of care and his last days will be a gift you have given to him. My prayers are with you and I know the hospice will not let him suffer.
Take Care
Maria