Vitamin D is important for dogs, just as it is for humans. It helps regulate calcium and phosphorus levels in the body, which are necessary for strong bones. In dogs, vitamin D deficiency can lead to bone abnormalities such as osteomalacia and osteoporosis. City dogs may be at a higher risk of vitamin D deficiency because they may not get as much exposure to sunlight as dogs that live in rural areas. This is because urban environments often have a lot of buildings and structures that block the sun’s rays. It is important for owners of city dogs to ensure that their pets are getting enough vitamin D in their diet or through supplements. This can be achieved through a balanced diet that includes foods rich in vitamin D, such as fatty fish, or through the use of a vitamin D supplement. It is always best to consult with a veterinarian before starting any new supplement regimen for your pet.