Custom Post to RSS Rules

Hi, I'm trying to make an RSS feed in "Post to RSS Rules", and I want a certain RSS feed to be made that only  shows posts that have the keyword "dog" in the title. I have added the word "dog" in the Advanced Feed Query (for advanced users only!), but it will only show the last posts, not the one with the keyword. Every RSS feed shows the same last posts. How can I create RSS feeds with a certain keyword that is in the title? Thank you!