The most common side effects of metronidazole tablets are digestive tract reactions, including nausea, vomiting, loss of appetite and abdominal cramps. Symptoms of nervous system include headache, dizziness, occasional paresthesia, numbness of limbs, ataxia and polyneuritis. Large doses can cause convulsions.
If the dog has intestinal problems, you can consult a pet doctor and take medicine.
If it is a general problem, you can go to E Pet to find probiotics to regulate the dog's stomach and help digestion.