What feature distinguishes cutaneous hemangiosarcoma from other types?

Cutaneous hemangiosarcoma is particularly noted for its association with sun exposure, especially in older dogs. This tumor type often arises in areas of the skin that have been exposed to sunlight, which correlates with the risk factors for skin cancers. The presence of hair does not protect against these tumors; rather, it is the ultraviolet (UV) radiation from sun exposure that can lead to the development of hemangiosarcoma in the skin, particularly in breeds that are more susceptible.

The other choices do not accurately describe the distinguishing features of cutaneous hemangiosarcoma. For instance, this condition is not primarily located in the bone, nor does it typically occur on fur-covered skin without noting the risk associated with UV exposure. While hemangiosarcoma is indeed aggressive and can metastasize rapidly, this characteristic is not exclusive to cutaneous hemangiosarcoma and is shared with other types of malignancies, making it a less distinguishing feature. The link to sun exposure in older dogs provides a more specific context for this type of cancer and sets it apart from other tumor types.