A dog jumps and catches a Frisbee in the grass .
It is certain that the dog is a world-champion Frisbee catcher , and goes to competitions all over the country with his/her master .
It is impossible that the dog is a world-champion Frisbee catcher , and goes to competitions all over the country with his/her master .
It is certain that the dog is a world-champion Frisbee catcher , and goes to competitions all over the country with his/her master .
The dog is a world-champion Frisbee catcher , and goes to competitions all over the country with his/her master .