Dracula Chapter 12 - Please

Lucy has a happy flirtatious quality to her until she gets bitten by Dracula. Dracula's attacks take away her strength, making it seem like she has an illness which her friend Dr. Seward cannot diagnose. She eventually dies and becomes a vampire herself. She then terrorizes children, becoming known as the "bloofer lady" in local papers. There is a sexulaity to Lucy that comes out before and after she is bit. The sexual repression of Voctorian society, especially in women, is a theme in this story.  

Which animal does he describe and why?