A relaxed tail and open mouth actually mean your dog is chill and not on high alert. This relaxed posture, combined with attentive ears, shows they’re simply curious about their surroundings. There’s nothing to worry about; your pup is just taking in the world in a relaxed way.
Also, keep it simple; overly complicated names can be hard for your dog to recognize. Stick with a two-syllable name ending in a vowel; these are easiest for dogs to understand and respond to. A good name makes communication smoother for both of you!