If you'd like to help the pets of Japan, I recommend donating to World Vets.
About World Vets, from their website:
World Vets is a non-government organization (NGO) providing veterinary aid around the globe in collaboration with animal advocacy groups, foreign governments, US and foreign military groups and veterinary professionals abroad. Our work spans 25 countries and 6 continents and addresses not only veterinary issues, but also human health issues impacted by zoonotic diseases in developing countries. World Vets is a 501c3 nonprofit organization.