Dog meat and dog blood have the properties of warming fire and helping yang; Monopterus albus is sweet and warm, and both of them eat together. Warming is more effective in helping fire, which is not conducive to ordinary people. Moreover, Monopterus albus has fishy smell, and it can't be cooked with dog meat.

In addition, the poisonous Monopterus albus is easily mistaken for food. Generally, Monopterus albus is nontoxic and delicious, but it is poisonous in the following two situations. First, water pollution: toxic substances in the water accumulate in the eel body and reach a certain concentration. If people eat it by mistake, it will cause illness and death. Second, histamine poisoning: Monopterus albus has a high content of protein, including free histidine. After the death of Monopterus albus, a large number of histidine decarboxylases were formed due to the growth and reproduction of microorganisms, and histidine was decarboxylated under the catalysis of decarboxylases to form histamine. People will also be poisoned if they eat eel containing histamine. If people eat poisonous Monopterus albus with other things, it is easy to mistake it for food.