It is extremely dangerous to administer medication to your dog without the guidance of a veterinarian.
Here's why:
* Incorrect dosage: Giving the wrong amount of medication can be fatal.
* Drug interactions: Ampicillin may interact with other medications your dog is taking or have underlying medical conditions.
* Underlying conditions: A fever is a symptom, and it's crucial to determine the cause before treating it.
What you should do:
1. Contact your veterinarian immediately. Even though it's the weekend, they might be able to offer emergency advice or refer you to an emergency clinic.
2. Take your dog's temperature again. Make sure the thermometer is working properly.
3. Monitor your dog closely. Look for signs of lethargy, loss of appetite, vomiting, diarrhea, or difficulty breathing.
Please remember: Your dog's health is your priority. Seeking professional veterinary care is the only safe and responsible course of action.