Dried mulberries typically have a higher sugar content compared to fresh mulberries. The drying process concentrates the natural sugars in the fruit, making them sweeter. Additionally, some dried mulberries may be sweetened with additional sugar before packaging. It's important to keep in mind that too much sugar in a dog's diet can lead to obesity and other health problems, so it's best to feed dried mulberries to your dog in small amounts or only the fresh berries.