In a life of purple-haze twists and tie-dyed turns, a few constants have anchored Maddy Sobel: Her artwork, making jams and jellies, and the Grateful Dead. But after three strokes, a head injury and a bout of seizures, nothing has been more important than her faithful support dogs. 

First came Misha, a gorgeous sable German shepherd who passed away in 2017. She’s buried beneath a rock garden in Maddy’s front yard in Point Reyes…