Soft tissue sarcomas are one of the most common cancers affecting our canine companions. These tumors develop from a variety of soft tissue cells throughout the body, forming masses that pet owners often discover while petting their dogs. Soft tissue sarcomas can appear anywhere on the body but are frequently found on the limbs, trunk, head, and neck. This broad category of tumors includes various subtypes, each originating from different cell types such as muscle, fat, or nerve tissue.