Answer:
It is best to experiment with small amounts of cheese to check your dog's tolerance.
Step-by-step explanation:
Summaries should consist of key details that support the main idea of the original passage and not add new, unrelated information.
Main Idea
The existing passage mainly talks about how cheese can be harmful to some dogs due to intolerance. The passage gives different information about both the pros and cons of giving dogs cheese. Specifically, the text focuses on the intolerance some dogs have to cheese and the uses of cheese.
Adding to the Summary
When adding to a summary, the main idea should not change. So, another detail that supports the purpose of the passage is the best option.
The best answer choice is the last one given. This detail also focuses on dogs' intolerance to cheese, and how an owner can still have their dogs benefit from small amounts of cheese.
The first answer choice adds an unnecessary opinion that does not match the tone of the rest of the summary.
The next 2 answer choices add details that do not relate to dogs' tolerance or the benefits of cheese. So, they should not be added.