meaning of 'trained hound'

[Ildiko Stuban]

Test No. incompl/inter-27 "The Two Dogs", question 1

A man had two dogs: a hound ......... to help him with his sports and another to guard the house.

(a) trained
(b) tutored
(c) brought up
(d) educated

Test No. incompl/inter-27 "The Two Dogs", answer 1

A man had two dogs: a hound trained to help him with his sports and another to guard the house.

Correct answer: (a) trained
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Please, give me the axplanation.
Thanks.

[Alan]

If you train animals, you are teaching them to do certain activities.
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English as a Second Language
You can read my ESL story Phrasal Verbs/bring