Animals have distinct ventral and dorsal portions, hence this is untrue. Animals' abdomens are referred to as ventral because they are on the bottom, while their backs are referred to as dorsal because they are on the top.
Humans are bipedal, thus everything farther back or close to our hind end is referred to as posterior, while anything higher in position or close to our head is referred to as anterior.
You can't always use anterior/ventral and posterior/dorsal interchangeably. Ventral relates more to the belly or abdomen, whereas anterior refers to the area closer to the head or front of the body. Even while these terms can be used interchangeably when referring to human anatomy, it is incorrect to do so when discussing four-legged animals.
If one is speaking about the animal's front, the belly and abdomen are parallel to the ground, which doesn't truly point toward the head. Similar to how one cannot refer to the back as the posterior since it would mean the back's rear, one cannot refer to the back as the posterior.
Despite the fact that these terminologies may be used to describe a person in anatomical position, they cannot adequately describe the posture of four-legged creatures that move on their four legs.
Here is another question with an answer similar to this about anterior/ventral and posterior/dorsal: https://brainly.com/question/16987279
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Question correction:
Your friend assures you that anterior and posterior can always be used interchangeably with ventral and dorsal. Politely explain to him/her that this statement is not always true. (HINT: think about what these terms mean for four-legged animals).
