During the sign-up process, we will ask you to provide basic information about all of your dogs. However, we can only enroll one dog per household. Littermates, housemates, and multigenerational groups can provide very interesting data, and some studies are specifically designed for them. At the Dog Aging Project, the goal is diversity among study participants. This is why we limit enrollment to one dog per household. In addition, this practice avoids errors and mix-ups during data collection, which could undermine the scientific integrity of our research, and it allows us to gather information from as many different environments as possible. You can read more in our blog post about this topic.