Cecilia's coloring is called agouti. It's not a breed, just a coat pattern and color. It was originally bred to resemble wild rabbit. The coat is a mix of individual brown, beige, and black hairs, all closely intermingled. Her ear tips are black, and her tail is black on top and white underneath. (When this coat type is grey, white and black, instead of brown, beige and black, it is called chinchilla.) When I first saw her, she reminded me of Durer's rabbit. Now, not so much- she's plumped up quite a bit. *sigh*... haven't we all.
I just love it when she flops down on the floor like this. She looks so happy.