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 most controversial diet for dogs suffering from kidney disease is the low protein diet. Diets that are low in protein generate less nitrogenous waste. Too much nitrogenous waste can cause vomiting and nausea. Careful administration of low protein diets is a must in order to avoid malnutrition of the dog.