This is a service dog wearing a safety vest. It is a kind of working dog. They are the dogs that contribute the most to humans. It is not a polysemous word, it only means a dog like the service dog. It and
🦮 (guide dog) are both a kind of working dog. It should be noted that this emoji was added to emoji in 2019. On most platforms and operating systems, this emoji may not be displayed properly.