Secondhand smoke increases the risk of cancer in some dogs. Scottish Terriers exposed to cigarette smoke at home were six times more likely to develop bladder cancer than their counterparts in non-smoking homes.
Another significant risk was living within a mile of a swamp or wetland - areas where pollutants can accumulate or are treated with insecticides. Older age and previous urinary tract infections were also associated with a higher risk of bladder cancer. The study was funded in part by a grant from the Scottish Terrier Club of America.