Several months ago, when Gracie first tore her ACL, we were at the vet's office in Portland waiting for the official verdict. Gracie, who was limited to three good legs, laid on the floor between my sister and me. My sister said "oh, a fly." Gracie was calmly looked up and as the fly zipped past her, she nipped it in mid-flight. Such is her proficiency in fly-catching.
There are some days when I purposely let a fly in the house, just to provide a challenge for Gracie. Gee, I hope the People for the Ethical Treatment of Flies don't find out.