Dogs do recognize familiar dogs, particularly those they have had repeated interactions with or share close bonds due to cohabitation or consistent socialization together. Dogs are highly social animals that rely on scent, body language, vocalizations, and other non-verbal cues to communicate with each other. They can recognize individual scents of other dogs and remember previous encounters based on these scents alone. In addition to scents, dogs are also observant of body postures and behaviors in other dogs which assists in identifying dogs they are familiar with versus unfamiliar ones. It's important to note that while dogs may recognize familiar animals easily, they still need appropriate introductions and gradual acclimation processes when encountering new dogs to ensure safe and positive interactions.