Two last horses are recovering at Five Brooks Ranch from an outbreak of equine distemper, a bacterial infection often called “strangles” because it can swell lymph nodes in the throat to the point of suffocation. Over the past month, the ranch, located on parkland in the Olema Valley, fielded over 50 phone calls from concerned horse riders and owners. The highly contagious mumps-like disease affected six of owner Andrew Loose’s 35 horses. “It looks ugly,…