Less serious side effects include: 1  Loss of appetite. 2  Weight loss. 3  Nausea. 4  Vomiting. 5  Diarrhea. 6  Frequent urination. 7  Muscle cramps, painful and swollen joints. 8  Excessive tiredness. 9  Difficulty falling asleep. 10  Headache, nervousness, dizziness. 11  Depression, mood swings. 12  Vivid dreams.
Nausea can occur in dogs for many reasons, particularly when the digestive tract and nervous systems are out of balance. Stress can certainly play a role in nausea.
The only ones that are safe are fiber,mineral oil and infant glycerin suppositories.You can also try adding plain canned pumpkin to the dog's food.Never use any Fleet Enemas,as they are toxic to animals. If the constipation is chronic,you should take the dog to a vet,as it could be a sign of an obstruction or tumor.