In dogs with chocolate toxicosis, which of the following is a common clinical sign?

In cases of chocolate toxicosis in dogs, tachycardia is a common clinical sign due to the presence of theobromine and caffeine in chocolate. Both substances are stimulants that can lead to increased heart rate and can even contribute to arrhythmias. The dog's cardiovascular system responds to these stimulants by increasing heart rate to maintain proper blood circulation and oxygen delivery in the body.

While paralysis and hyperpigmentation are not typically associated with chocolate toxicosis, bradycardia, a decreased heart rate, is also contrary to what occurs in cases of chocolate ingestion. Therefore, tachycardia stands out as a key clinical sign that veterinarians often monitor and assess when treating dogs that have ingested chocolate, making it a significant point in diagnosing and managing this condition.