Is cooked bass safe for a very small dog, like a Chihuahua, or is the risk different for larger breeds?

Yes, cooked bass is safe for dogs of all sizes as a lean protein source, but the portion size is absolutely critical. A safe treat for a large dog could be a dangerous choking hazard or cause an upset stomach in a tiny Chihuahua. For a small breed, offer only a few, thoroughly deboned, flaked pieces no bigger than a pea. The risk isn't toxicity, but rather obstruction or digestive upset from too much rich food. Always start with a minuscule amount to see how your individual dog tolerates it.