Smucker, known for its peanut butter, jam and Folgers coffee, is betting on rising pet ownership in the United States, a trend that has already attracted interest from investors and encouraged companies to sell up or go public. More U.S. households have pets than children, according to the American Pet Products Association. About 39 percent of the estimated $59 billion in pet-related spending was on food last year, according to its website. “With approximately two-thirds of U.S.