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.
Homeopathic remedies that have a great reputation for use in motion sickness in dogs include cocculus and aconitum. Giving one of these remedies in 30c potency 15 minutes before travel and then up to two more times every 30 to 60 minutes as needed is recommended to reduce nausea, vomiting, and anxiety during travel.