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.
Small amounts of beef liver and liver from other animals are usually okay to add to your dog food, but donât overdo it. In large amounts, liver can cause a condition known as âvitamin A toxicity.â Symptoms include stiffness, weight loss, constipation, lethargy, limping in the forelegs, and loss of appetite.