Clients travelling with Pets

We love our guests. We have several who have been coming back and forth since 1990. They love staying in our pet friendly homes and of course, the awesome and unbeatable location of these homes. But what do you say to people who travel with not just 1 or 2 or 3 but 4 pets? The income is awesome for they stay for at least 1 month. And actually, one with 4 pets stayed for more than 2 months. 2 months!
Your thoughts? Anybody?