Read the following context and choose the best option to answer the question.
Context: I found " My Smart Puppy " to be the best book out of a large selection we bought and to this day I am still regularly referring to it , both for our training and to help friends . Cara has a big brother , a Russian Blue cat by the name of Tindy . They get along really well and love to wrestle , it looks scary to visitors but they know each other 's limits !
Question: Why did I buy a book ?
Options: 
- None of the above choices .
 - My dog was hard to train
 - I wanted my cat to wrestle
 - My cat was hard to train


My dog was hard to train