Dogs are a form of domesticated canine, often kept by people as pets. They come in many different 'breeds', appearing in vastly different sizes, shapes and colours.
The Special Forces used two German Shepherd dogs when helping the Home Office Anomaly-investigating team to try and track down a Future Predator in the Forest of Dean. The dogs started barking when an adult Predator was nearby because they could hear the high frequency echolocation noises, but they didn't bark when near the babies.
A small female Terrier called Sprat, belonging to Taylor Craig, went through an Anomaly. Taylor followed it through, and, along with Nick Cutter and Stephen Hart, got stranded in the Silurian, however Sprat made it back through without them.
- When two students saw a Therocephalian in their School, one of them described it as a "evil rabid mutant dog". (Episode 4.4)
- During a Hyaenodon incursion during the wedding of Jenny Lewis, it was noted several times that the creatures bore a resemblence to giant dogs. However, the two species are not actually related. (Episode 4.6)