there has been talk about the use of dogs in medical detection of cancer and

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there has been talk about the use of dogs in medical detection of cancer and also dogs are being used to monitor the sugar levels of people with diabetes 24 hours a day. i was wondering what ethical issues there are surrounding the use of dogs in such a way, ie should we be breeding dogs specifically for use in hospitals and other moral dilemas. also the uk will not accept the use of dogs to detect cancer because there has been little study on how it works i was thinking is this relivent when this could save lives?