As my subject line says, "Funny, after you identify the cause."  We had a large dog that wedged herself in the walkway in a TT several years ago and..............  I have always loved dogs so this "inconvenience" was minor to me.  She was a wonderful dog, a 75 lb English Shepherd and none will ever compare to Duchess.  Though, I sometimes thought it was not a "gas" problem as much of a humidity issue with the detector being covered with her coat. This was in the winter to when air doesn't circulate as well with the doors and windows closed.  I know that when the humidity level gets high, we get false alarms on all of the different types of detectors.