Laika died because of a failure of the temperature control system; she essentially baked to death. Not to get offtopic, but if you want to get an idea of how she suffered, lots of dogs die every year in much the same way when their owners leave them in their cars on hot days. <img src="/images/icons/frown.gif" /><br /><br />There were many other dogs sent on suborbital and orbital flights by the USSR. I don't recall finding any others who perished, so perhaps that can bring some relief.<br /><br />If you want a harrowing tale of animal spaceflight, read about the American Biosatellite 3 flown in 1969. This was a plan to orbit a male monkey named Bonnie for a full month. The mission was aborted after just over a week because Bonnie's health was failing. I'm not sure whether they were able to recover Bonnie alive. <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>