Daniel's Law is currently in the process of being passed in Pennsylvania, and Daniel himself has a profile on Hero Dog Awards, where you can vote for him and/or make a donation.
According to his profile,
Daniel has taken nicely to the fun-loving life of a dog in a house with four other dogs. However, Daniel has also become quite the celebrity with appearances on local, national, and worldwide news outlets, highlighted by an exciting appearance on Anderson Cooper Live. Such renown has brought Daniel the opportunity to make a difference. Daniel’s adorable face and affable personality have made him a hero dog to thousands of his other canine brothers and sisters as he has become an advocate for shelter adoptions and anti-gassing laws in various state legislatures. "Daniel's Law" will soon be passed in Pennsylvania to outlaw the use of the gas chamber.Just click on the links above to see how you can show your support for Daniel's Law, either by spreading awareness, writing to your local senators, or making a donation.