The goal of this thesis is the static analysis of canine endoprostheses under a specific tensile load, replicating the forces acting during a dog's gait. This analysis is based on a finite element model (FEM) and subsequently validated through experimental laboratory tests. For this reason, it is crucial to investigate the behavior of the prosthesis and the prosthesis-bone complex under specific loading conditions to assess whether the prosthesis design and material are suitable for its intended function or prone to failure or hazardous deformations. The introductory chapter examines the most prevalent skeletal disease affecting dogs, for which no standardized treatment has yet been established: osteosarcoma.