Yes, you can mix dry and wet food together. Doing so can improve palatability and add extra moisture to your dog’s diet. For picky eaters, this is often a great way to encourage them to eat. For dogs with certain health concerns, the added moisture may also be beneficial depending on their specific needs.
If your dog develops loose stools when mixing foods, it usually means they’re being overfed. In that case, reduce the amount of either the dry or wet portion. It’s important to keep track of total calories to avoid overfeeding.