Premise: "A gray colored dog is licking a fallen tree in the forest."\nHypothesis: "A terrier is licking a tree."\nDo we know that the hypothesis entailed by the premise?
Let's be accurate as possible and think first.
it is not possible to tell
The dog that is licking a fallen tree is not necessarily a terrier.

.

So, the final answer is it is not possible to tell