The being is a dog species, as it directly said "I am a dog."

No, dogs cannot talk like humans. In the previous scenario, it's not possible for a dog to directly answer Ann's question. It was just an imaginative context. In reality, dogs communicate through body language and vocalizations, but they cannot have a conversation with humans through spoken language.

Yes, considering that dogs cannot talk, it is more likely that the being is not actually a dog. Its true species is unclear from the information provided, but it can communicate and is possibly imitating a dog or misrepresenting itself.

Based on the information provided, the most likely species of the being could be a human or possibly an intelligent non-human species or entity capable of speech and mimicking a dog. However, without more context and information, it is impossible to definitively determine its true species.