(Gresham, OR)  --  Police are looking for three suspects who are believed to have stolen money from a school that trains guide dogs for the blind.  Authorities say two men and a woman broke into vehicles owned by Guide Dogs for the Blind in Boring and stole gas credit cards.  The cards were used to make 48-hundred dollars in purchases at gas stations in Gresham, Troutdale, and Portland.  Police have images of the suspects from surveillance video.