Problem: Do "the black horse" and "his" point to the same thing in the following sentence?

When Mr. Bond , the veterinarian, came to look at the black horse that lay groaning on the grass, he felt him all over, and shook his head; one of *his* legs was broken.
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A: yes

Problem: Do "Mark" and "him" point to the same thing in the following sentence?

Mark heard Steve 's feet going down the ladder. The door of the shop closed after *him* . He ran to look out the window.
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A: no

Problem: Do "Madonna" and "she" point to the same thing in the following sentence?

Madonna fired her trainer because *she* slept with her boyfriend.
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A: no

Problem: Do "Toby" and "his" point to the same thing in the following sentence?

Billy cried because Toby wouldn't accept *his* toy.
****
A:
no