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LSATHacks › LSAT Explanations › Preptest 142 › Logical Reasoning › Question 21

LSAT 142 | Section 1 | Logical Reasoning: Q21

LSAT Preptest 142 explanations

LR Question 21 Explanation

QUESTION TEXT: In a study, pairs of trained dogs were placed side…

QUESTION TYPE: Argument Evaluation

CONCLUSION: Dogs don’t like being treated unfairly.

REASONING: Pairs of dogs were given a command. When both dogs obeyed, only one dog was rewarded. Eventually, the dogs that didn’t receive treats stopped obeying.

ANALYSIS: This question is talking about trained dogs. You surely know that dogs are often rewarded with treats or affection for obeying commands.

This argument has given a possible explanation for the dogs lack of obedience. Perhaps they did indeed feel they were being treated unfairly. But the argument didn’t rule out a likely alternative explanation: The dogs expected treats for obedience, and stopped obeyed when there were no treats (regardless of what happened to the other dog).

___________

  1. This is irrelevant. The stimulus is only talking about situations where both dogs obey, initially.
  2. CORRECT. This addresses an alternative explanation. It’s quite possibly that the dogs stopped obeying simply because they weren’t being rewarded. If both dogs went unrewarded and still stopped obeying, then that rules out fairness as an explanation. Both dogs received an equal, fair amount of treats: zero.
  3. The reverse of this answer would be interesting. If some dogs who didn’t receive treats were then given treats in later trials, that might affect the experiment. But this answer is only talking about dogs who receive treats and then later do not receive treats.
  4. “Any cases” is quite useless. You need to take vague answers at their weakest. If one dog became more inclined to obey, what does that prove?
  5. Who cares? The number of repetitions required doesn’t change the underlying theory. It’s not as if five repetitions would indicate unfairness was the cause, while ten repetitions would indicate that lack of reward was the cause.
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More Resources for Argument Evaluation Questions

  • Intro Course lesson: This intro course lesson covers Argument Evaluation questions.
  • Mastery Seminar lesson: This LR Mastery seminar lesson covers argument evaluation questions.
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Comments

  1. Leo Russo says

    September 29, 2025 at 9:00 pm

    Is (A) irrelevant since it doesn’t touch upon the fairness hypothesis? I’ve noticed a pattern in the wrong answers where another trial is brought up as a way to evaluate this trial. Is that why (B) is the only relevant answer because it touches upon a factor being changed in the study presented by the question stimulus?

    Reply
    • Aaminah_LSATHacks says Tutor

      October 13, 2025 at 2:52 pm

      Yes, pretty much! A introduces a different variable (prior conditioning), but not whether fairness specifically caused the behavior. Which is why Graeme says A is irrelevant.

      I wouldn’t necessarily say wrong answers bring up another trial, but rather that they address tangential or related variables without actually addressing the one that is being tested in the stimulus. And B is indeed the only one that directly tests the fairness explanation by changing a key element of the study (if both dogs get no rewards and obedience still drops, that would suggest the issue isn’t fairness but lack of reward).

      Reply
  2. Riss says

    June 7, 2021 at 3:18 pm

    It seems to me that choice C as it is presented could still affect the experiment. If a dog is accustomed to receiving treats, then is placed in the group where it receives no treats, couldn’t obedience decrease simply because they are no longer getting treats (as opposed to obedience declining due to being treated unfairly)?

    Reply
    • Rosalie (LSATHacks) says Tutor

      June 10, 2021 at 10:50 am

      C is out of scope. Participating in previous trials might explain initial obedience, but it still wouldn’t explain why the obedience declined over time. This is a self-contained study and the conclusion addresses “fairness”, so the correct answer choice needs to touch on these two.

      Reply

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