Writing a good informational book on how to stop cats from spraying may sound tricky. But, if you know to write in an interesting manner, then you can pull it off somehow. It is important to know your audience when you are writing something. In this case, since you are writing book on how to stop cats from spraying, your audience would be those people who are trying to stop their cats from spraying. These are people who have pet cats at home.
If you want to put your points across to those struggling cat owners in the best manner possible, then you need to write your book in such a way that you are talking to them as if you are sitting in front of those cat owners and explaining them how to stop cats from spraying. Writing like this would be a lot more effective. Your audience would feel inspirational while reading your book. They would be inspired to take action. They would be willing to use the methods described in your book to stop cats from spraying.
Your book on stopping cats from spraying should be written in a relaxed and conversational style so that the cat owners who read your book would enjoy reading it.