Premise: "The black dog is sniffing the brown dog's butt."\nHypothesis: "Two dogs meet each other for the first time."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step below.
it is not possible to tell
The fact that black dog is sniffing the brown dog's butt doesn't imply dogs meet each other for the first time.

.

Thus, the answer is it is not possible to tell