mr sticky made some really important points. One doesn't have to be euthanized to have a dignified death. One thing nobody has brought up here is the concept of palliative care. It comes up most frequently with cancer patients, but is certainly relevant to your situation as well.
Palliative care involves management of disturbing symptoms, and optimizing quality of life while realizing that the underlying disease process (Alzheimers in this case) will continue to progress. In the States and elsewhere, Hospice care is often the most effective way of giving palliation. I'm sure you could learn a lot more about hospice by doing a google search. It's a nationwide (world-wide really) organization, with chapters at the local level. They can help you and your family decide what you really want. I can guarantee you, if he's a Hospice patient and doesn't want interventions like IV's etc he will NOT be getting them.
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