Dog spots Cancer on owner twice

if dogs can smell cancer maybe that means it is an evolutionary adoption, which may mean that there would be selective pressure due to dogs being able to do something about cancer. Maybe they could study what dogs do when a dog gets cancer.
 
but maybe they just gnaw an external tumour off themselves or other dogs..I think I read that that happens.
 
Dogs have discovered cancer several times on owners. Their noses are just fabulous. I guess it's some scents that a person with cancer will give away. So perhaps some dogs could be trained to smell cancer? But I really don't see hospitals have an army of cancer smelling dogs in their staff.

Example landmine dogs. They have found out that they can take "smell examples" from a field, and test it in a lab, and then the dog can decide if it's landmines in that particular area or not. They can smell people burried in avalanges, and people laying under water. And some dogs' trackingskills are amazing. And drugs, money, weapon, food and what ever you want to teach them to smell.
 
Aren't they also able to know when an epileptic person is about to have a seizure? I saw it in a movie so maybe it's not really true.
 
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Yes, they can. And I've seen a dog trained to push a woman's head back in position when she had a kind of fit. She had an strange kind of illness, and could die if her head was in wrong position.
 
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Dogs can sniff out cancers, bacteria such as C diff, bed bugs, low blood sugar (before severe symptoms hit) along with the stuff everyone knows about like drugs, bombs, lost humans, etc. I remember reading years ago about a dog that kept sniffing at a spot on a person (can't remember now if the dog was being trained for cancer detection or if it was the person's dog), doctor removed a piece, pathology said it was nothing, the dog still kept going for the spot, they removed the whole thing and it was melanoma. I've read of pet dogs picking up on breast and other tumors in their humans too. They are amazing creatures with amazing noses.
 
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Aren't they also able to know when an epileptic person is about to have a seizure? I saw it in a movie so maybe it's not really true.

There are seizure-detection dogs. I know a lady who trained her husky for it, which I thought was amazing, since she trained him herself and isn't a professional trainer, and he's a husky and huskies tend to follow their own rules and aren't usually used for such things because they are so independent. But she can now bike and do other thinks with her dog (can't drive because seizures aren't controlled) because he will warn her when to stop and get down on the ground.
 
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