Answer
The danger is that there may be possibilities not apparent from sample data. For example, two owners might have pets with the same name.
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Database Concepts
by Kroenke, David; Auer, David;
Published by
Pearson
ISBN 10:
0133544621
ISBN 13:
978-0-13354-462-6
Chapter 2 - The Relational Model - Review Questions - Page 107: 2.32
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