Short Answer 
The procedure involves identifying the pets owned by each individual, creating a Venn Diagram to visualize the relationships between their pets, and determining that Cyrus has the least unique pets among them, making him significant to the answer.
Step 1: Identify the Pets Owned by Each Person
To begin answering the question, we first need to list the pets owned by each individual. Understanding the ownership will help to visualize the distribution of pets among them. The pets are as follows:
- Carly: dog
- Sandi: dog, chicken, rabbit
- Pedro: cat, chicken, rabbit
- Cyrus: cat, rabbit
Step 2: Create the Venn Diagram
Next, we will utilize a Venn Diagram to visually represent the relationships and overlaps among the pets owned by each person. This helps in easily identifying common pets and unique ownerships. In this case, the diagram will show:
- Common pets like chicken and rabbit among multiple people.
- Unique pets owned by Carly (dog) and others.
Step 3: Determine the Answer
By analyzing the Venn Diagram, we can conclude that the individual with the least unique pets is significant for answering the question. In this case, after reviewing the ownerships, it can be determined that Cyrus has the unique combination that qualifies them for the answer.