Surprisingly, I somehow failed to notice this until yesterday. If it becomes an issue, I am not in any way attached to the name - i'd be happy to change it.
Not really, because it doesn't need to be a real word or an existing name. It could be Rexfus, for example. Even the dot com is available, and as a combination of Rex and Rufus, still dog inspired.
That was me trying to be clever choosing a quintessential dog name, as the application "fetches" the paper (rss feeds) for you :D . I was playing around with the name Rover and a few others for a while as well, but went with Rufus for the cheap .news TLD
I don't think it's an issue, but it'll be harder for your tool to be at the top of search engine results, so some rebranding might be beneficial for your visibility.