I have used Chewy for years. With 8 rescue animals in the house, I use a lot of products! You can customize your preferred delivery date or change it when the unexpected happens. The key to being a happy customer is to call their outstanding customer service whenever you have a question or problem. Don't miss the medication section. Sometimes you can save $$$. The most common response I have heard when I ask someone if they use Chewy is, "I love Chewy!"