Thanks for the comments, but I had to laugh - this is NOT a cut and paste - she was shot against a black velvet background exactly as it looks - this is straight out of camera!
I love this shot. I would tend to agree with the sharp edges but although i am no expert by a long way but i think feathering it would have made it look great.
I am sorry but I don't like the way the dog looks so very obviously pasted onto the background. Would feathering help here? (I'm not terribly good with photoshop, hence the question mark)