The Question and Answer section for The Island of Dr. Moreau is a great resource to ask questions, find answers, and discuss the novel.
After Moreau vivisected the puma it suffered greatly. When the puma managed to escape, Moreau went after it..... and subsequently, the puma killed him.
I remember it was an "odd" shape but not the exact configuration.
The main theme in The Island of Doctor Moreau is the distinction between man and beast.