Dogs and trees have one thing in common, which is that they both have bark. However, some sources suggest that dogs and trees have more than one thing in common. For example, both dogs and trees are essential for human life. Trees create cleaner oxygen, which is necessary for breathing, while dogs are often kept as pets and provide companionship to their owners. Additionally, some sources suggest that both dogs and trees have evolved from a universal common ancestor, as they share common features such as trunks, branches, and long bodies. However, it is important to note that these commonalities are not necessarily significant or meaningful in any scientific or biological sense.