Gates is co-author, with Chuck Collins, of the book Wealth and Our Commonwealth: Why America Should Tax Accumulated Fortunes, a defense of the policies promoted by the estate tax. He married Mary Maxwell Gates, whom he met at UW, and who died in 1994. They had three children: Kristianne, Bill, and Libby.
Symptoms of heartworm disease may include loss of appetite, lethargy, exercise intolerance, weight loss, fever, dyspnea (difficult, labored breathing, shortness of breath), coughing, weakness, dull dry coat, and hemorrhage. There are no symptoms at all until the disease is advanced.
One of the most severe signs of heartworms in dogs (and cats) is called Caval Syndrome or Vena Cava Syndrome. This is seen when there are large numbers of adult worms (usually around 100 or more) invade the heart. There is almost complete blockage of all blood flow.