Notice and begin to appreciate the fact
that dogs do not apologize.
Quoted from "How to Break Up a Dogfight" in Thomas's wonderful memoir A Three Dog Night (Harcourt, 2006).
Thomas, daughter of Lewis Thomas (Lives of a Cell) also is the author of Safekeeping: Some True Stories from a Life (Anchor, Reprint, 2007) and Thinking About Memoir (Sterling, 2008), among other books. She also "make[s] paintings", although she sells only prints of them; see her work here and here.
"The Lives of Books with Abigail Thomas" (Video)