The dog that got hurt in sentence 2 may not have gone headfirst into the long grass.
This justifies what answer for what question? Q & A: 
Premise: "A dog goes headfirst into the long grass from the sand."
Hypothesis: "There is a dog outdoors who got hurt in the grass."
Do we know that the hypothesis entailed by the premise?
it is not possible to tell
The dog that got hurt in sentence 2 may not have gone headfirst into the long grass.
This justifies what answer for what question? Q & A: 
user
Premise: "A dog goes headfirst into the long grass from the sand."
Hypothesis: "There is a dog outdoors who got hurt in the grass."
Do we know that the hypothesis entailed by the premise?
it is not possible to tell
assistant
The dog that got hurt in sentence 2 may not have gone headfirst into the long grass.
This justifies what answer for what question? Q & A: 
Premise: "A dog goes headfirst into the long grass from the sand."
Hypothesis: "There is a dog outdoors who got hurt in the grass."
Do we know that the hypothesis entailed by the premise?
it is not possible to tell