Rhicephalus sanguineus's toothy hypostome
Rhipicephalus sanguineus is the common tick and often found on dogs. These little critters don't transmit Lyme disease but they can transmit a type of bacterial family, Rickettsiaceae. What's weird about Rickettsiaceae is that if they infect a larval tick the tick dies. But if an adult tick is infected it can survive to bite a human or other mammal and infect them. This spiky mouth part definitely shows how they're holding on the skin!