Bones (2005)

S4E4 The Finger in the Nest

Parker, Booth's son, stumbles upon a severed finger in a bird's nest, prompting the team to initiate a thorough investigation to locate the rest of the body. Once they uncover the remains, they learn the cause of death was a dog attack, which leads them to an underground dog fighting operation. The team embarks on a quest to track down both the vicious dog and its owner, hoping to bring them to justice.