Do dogs wander off to die?

My family realized today that we hadn't seen our 14-year-old chow/cockerspaniel-mix all day. Usually she just lays around the house. She has arthritis in her hips and has lived a lot longer than we expected. But today when we couldn't find her it immediately came to our minds that she may be dead, but we... show more My family realized today that we hadn't seen our 14-year-old chow/cockerspaniel-mix all day. Usually she just lays around the house. She has arthritis in her hips and has lived a lot longer than we expected. But today when we couldn't find her it immediately came to our minds that she may be dead, but we can't find her. Do dogs wander off to die on their own? I heard that about dogs, but I don't know if it's true. Do you have any suggestions how to find her, or even if we should go about finding her if she's gone off to die?
:(
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