While direct, acute kidney failure from chocolate is not the most common initial manifestation, chronic or severe toxicity can indirectly contribute to kidney problems.
What is chocolate poisoning? Chocolate contains caffeine and theobromine, which can have effects on the central nervous system, heart, and kidneys. Humans can break down and excrete these substances much more efficiently than dogs can, which is why chocolate is not toxic to humans but can potentially make dogs very sick. The amounts of caffeine and theobromine in chocolate vary depending on ...

In severe cases, symptoms can include cardiac arrhythmias, muscle tremors, and seizures. Complications such as aspiration pneumonia from vomiting or prolonged clinical signs can make the prognosis for chocolate poisoning worse. Clinical signs of chocolate poisoning can take several hours to develop and signs can last for several days.

Furthermore, visual representations like the one above help us fully grasp the concept of Chocolate Toxicity And Kidney Failure In Dogs Kidney Failure Symptoms.
The outcome of chocolate toxicity depends on the amount and type ingested, the dogs weight and how promptly treatment was initiated. Delaying treatment from the time a dog eats chocolate can worsen the associated clinical signs and prognosis. Darker and more bitter chocolates are more toxic to dogs, but all forms of chocolate carry some risks.
Chocolate toxicosis in animals may result in potentially life-threatening cardiac arrhythmias and CNS dysfunction. Chocolate poisoning occurs most commonly in dogs, although many species are susceptible. Dogs are most often affected because of their indiscriminate eating habits and easy access to sources of chocolate.