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It sounds like your inquiry could be misunderstood. Until my information was last updated in January 2022, I was unaware that a breed could be termed a "Harrier Dog." A unique hound breed, the Harrier is well-known for its amiability and skill on the hunt. Nevertheless, I can give you the rundown on what dogs should wear in terms of temperature concerns in general. If you happen to have a particular breed in mind, let me know so I can tailor my responses.

While most dogs can handle a wide variety of temperatures, individual dogs can have vastly different tolerances depending on things like age, health, acclimatization, and breed. Within the temperature range of 60°F to 80°F (15°C to 27°C) is the most comfortable range for the majority of dogs, including Harriers. Shelter, bedding, and protection from severe weather allow them to endure colder temperatures.

Being primarily a hunting breed, harriers tend to be somewhat laid-back and enjoy spending time outdoors. To keep them from overheating in hot weather, be sure to provide them water and shade. But in colder regions, they might use some extra insulation, like a dog sweater, and some protection from the worst of the cold, particularly if their coats are short.

Keep an eye on your dog's health and behavior in all kinds of weather. Overly shallow breathing, listlessness, shivering, or running for cover are symptoms of heat exhaustion. On hot days, don't walk your dog while the temperature is at its highest, and on cold days, keep him out of the cold as much as possible.

The best approach to make sure your Harrier (or any dog) is okay in different weather is to provide them the attention they need, watch how they act, and change things up as needed. For information unique to your pet's breed and any other personal health concerns, it's best to contact your vet.