The Saint Bernard was wearing a service vest and tearing into a quadriplegic woman’s golden retriever on the floor of the mall food court. Both dogs were allegedly service animals. But after mall security tore the Saint Bernard off, its owner blamed the other dog owner’s disability. “He said his dog was startled by her wheelchair,” Angela Eaton, one the golden retriever’s trainers told the Daily Beast. “Well service dogs should be growing up around a wheelchair.” Service animal fraud is a growing problem in dog-friendly Colorado, says Eaton, who has been training service dogs for 35 years. State legislators...