9. LAWN CHEMICALS
The health impacts of pets coming into contact with chemical weed and bug killers could be immediate or they could take years to surface. A 2012 study published in Environmental Health found dogs with malignant lymphoma were 70 more likely to live in a home where professionals applied chemical lawn treatments. Dogs with the serious malignancy were also 170 percent more likely to come from homes in which owners used chemical insecticides to combat pests inside of the home.