2. Take your dog's temperature. A fever can be a sign of infection or other serious medical conditions, so it's important to take your dog's temperature if they're shaking and sick. The normal body temperature for a dog is between 101 and 102.5 degrees Fahrenheit. A temperature of 103 degrees Fahrenheit or higher is considered to be a fever.
3. Check your dog's gums. The color of your dog's gums can also be an indicator of their health. Healthy gums should be pink and moist. Pale, white, or bluish gums can indicate anemia, dehydration, or other serious medical problems.
4. Check your dog's heart rate and breathing. If your dog's heart rate is too fast or too slow, it can be a sign of heart disease or other medical problems. The normal heart rate for a dog is between 60 and 120 beats per minute. If your dog's heart rate is above 120 beats per minute, it's considered to be a tachycardia, and if it's below 60 beats per minute, it's considered to be a bradycardia.
5. If you're concerned about your dog's health, take them to the vet as soon as possible. The vet will be able to diagnose your dog's condition and recommend the best course of treatment.
6. In the meantime, there are some things you can do to help your dog feel more comfortable. Try to keep them calm and quiet, and offer them small amounts of water to drink. If they're vomiting or have diarrhea, you can give them over-the-counter medications like Pepto-Bismol or Kaopectate. Always check with your vet before giving your dog any medication.