If this is not a trick question, the answer is 10990. Sorry, it's a middle school level question.

Breakdown:

A. Girls legs: 7 girls *2 legs/girl= 14 legs

B. Big cat legs: [7 girls * 7 bags/girl * 7 big cats/bag] * 4 legs/big cat = 1372 legs

C. Small cat legs: [7 girls * 7 bags/girl * 7 big cats/bag * 7 small cats/ big cat] * 4 legs/small cat = 9604 legs

Total of A, B and C is 10, 990 legs.