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.
The larvae enter a new animal's body when it is bitten by an infected mosquito. Larvae mature and migrate to the pet's heart. Worms in the heart mate and produce microfilariae (6-7 months after infection in dogs, 8 months in cats). An important part of a complete heartworm prevention program is testing. All dogs should be tested for heartworm infection before starting a preventive program.