1. Pudding belongs to the third-line rat and generally does not bite. Bite you may be scared by you, out of self-defense, or out of curiosity, use your finger as food and won't use force. 2. If you are bitten, wash the wound with clear water, squeeze out the blood and then clean it, and disinfect it with iodine after cleaning. 3. Hamsters love to be clean and have few viruses, so they don't need to be injected. If they want to seek psychological comfort, they can also take injections. Rabies vaccine has no side effects. 4. It may be that two mice are fighting, or they have a particularly strong feeling, or they are hungry, thirsty, or sick. It is suggested not to keep two hamsters in cages, which will lead to death. 5. The situation of my pudding: If the cage has two floors and there is a small house on it, you don't need to put sawdust in it when changing sawdust. The mouse is too cold to sleep in the house above, but in the house below. After a long time, he will naturally use the house above as a toilet (I don't know if your mouse is suitable), so that they can observe the dynamics of the mouse at any time. But it's better to have a toilet. If you buy a mouse toilet, you should put cat litter in it. I hope I can help you, hehe.