Premise & hypothesis.
A toddler sitting in a portable highchair enjoys a snack on the grass as his mother and possibly his older brother look on.

Someone is eating a snack.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
A man wearing protective clothing is being bitten on the arm by a dog.

A man is helping to train a dog for the military.
++++++++++
true or not.
it is not possible to tell

Premise & hypothesis.
A young boy throwing rocks into the water.

A young boy throws rocks.
++++++++++
true or not.
yes