The most fundamental principle is to go to the regular pet market, don't be greedy and cheap, and don't give those vendors an opportunity; Try to choose a regular merchant and ask the other party to show the quarantine certificate.
Carefully observe the overall condition and color of cats and dogs during the transaction; You can use canine distemper test paper (available in pet hospital) to quickly detect whether you are sick. Be sure to pay attention to details, such as the natural holes (eyes, ears, mouth, nostrils, anus, etc.) of pets. ) whether it is clean, whether the nose is wet, and whether there are pinholes on the body. Try to buy a dog for more than a month. Relatively speaking, the vaccine project is complete and the risk of illness is much lower.