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.
We never recommend inducing vomiting in dogs using any of these methods: 1  Physically sticking a finger down the throat (yes, people do this and itâs completely asinine!) 2  Mustard. 3  Salt (due to side effects from causing a very elevated sodium level) 4  Syrup of ipecac (due to profound side effects)