Thanks for your replies everyone! Black & white is definately one of my favourite photo styles. The first 3 pics are my purebred Chihuahua, and the last one is my Jack Russell x Maltese Terrier.
My Chihuahua, Abby, definately doesn't fit into the Chi stereotype. Everyone at our vet (who are big dog fans) now want chihuahuas!
Abby is really gorgeous, but I find it hard to take photos of her because she's scared of cameras, and she goes extrememly shy, and won't stay still!