The town’s Animal Control shelter—which occupies about 800 square feet in a non-insulated former incinerator building at the dump—is not suitable to house dogs and other animals, Selectman Nick Williams said Tuesday. Given that the shelter soon will need a new roof, which officials estimate will cost $75,000 to $80,000, New Canaan should plan for an improved future facility or to outsource the care of lost or dumped animals, Williams said during the Board of Selectmen’s regular meeting. “To be clear, we are talking about maybe 50, 60, 70 animals a year going in there—it’s not high usage but it’s also not a great place to keep animals,” Williams said. The building’s “only use is as an animal shelter, which is a dump,” he said. “A dump within a dump—I’m sorry, a dump within a ‘Transfer Station,’ ” Williams said.