ive got a whippet x collie,greyhound, she's about 12 month old now ive got her lamping and every now and then not on every run she will give one or two yips while chasing the rabbit,it bothers me a little but she's only young and there is potential for her to be a good all round little bitch, the thing that annoys me most is she has a tendancy to hunt a bit if she misses the rabbit,she's really keen.