Premise: "A white dog catching a milkbone in his mouth."
Hypothesis: "A dog is rewarded with a treat after successfully performing a trick."
Do we know that the hypothesis entailed by the premise? Let's be accurate as possible and think first.
The dog caught a milkbone in his mouth but the dog was not necessarily being rewarded. The dog also may or may not have been successfully performing a trick. The dog could have a treat just because his owner wanted him to have one. Final answer: it is not possible to tell.