If you suspect that your dog has a fever, the first thing you should do is consult with your veterinarian. A fever can be a symptom of an underlying condition, so it's important to identify the root cause and treat it accordingly.
That being said, there are some things you can do to help manage your dog's fever in the meantime. One thing you can do is keep your dog cool and comfortable. You can do this by providing plenty of fresh water, keeping your dog in a cool room, and using a damp cloth to wipe your dog's face and paws.
You can also consider giving your dog a cool bath or placing a cool, damp towel on your dog's forehead. However, be careful not to use ice-cold water or ice packs, as these can actually cause your dog's body to go into shock.
It's generally not recommended to give your dog over-the-counter medications without consulting with your veterinarian first. Some human medications, such as acetaminophen (Tylenol) and ibuprofen (Advil), can be toxic to dogs and can even be fatal in certain cases.
In summary, the best thing you can do for your dog if you suspect they have a fever is to consult with your veterinarian and follow their advice. In the meantime, focus on keeping your dog comfortable and cool.