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.
Herbs For Dog Motion Sickness. 1  Ginger: Ginger has long been used in Asia to treat motion sickness symptoms such as nausea and upset stomach. If your dog suffers from car sickness, keep some ginger cookies in the car and feed her some when she gets on the car. 2  Peppermint: Another herb that is effective is peppermint.