The most frequent causes of dog death and pet disease among old dogs are cancer, cardiac failure, and renal (kidney) failure. (1800petmeds.com)
Also, remember pool covers are responsible for many dog deaths each year, so don't assume that your dog will stay off of your pool cover. (okcpetsmagazine.com)
There are 600 cases of lethargy, and 31 reports of dog deaths. (wsbtv.com)