If it is too small, you can go directly to the pet store to buy a test strip, and you will know it as soon as you test it, and you don't need to wait too long.

The small size of the dog is an infectious disease that the dog is very susceptible to infection Virus disease, which usually occurs in puppies and dogs with low immunity, usually occurs after healthy susceptible dogs come into contact with sick dogs or pathogens. The symptoms mainly include vomiting, diarrhea, and blood pulling. If your dog has these symptoms, don't take it lightly and send it to the veterinarian for medical treatment immediately.  

The small size of dogs can occur all year round, mostly in winter and spring. One might wonder why? During this time period, the weather is cold, the temperature changes suddenly, and the high stocking density leads to crowding (this time period is also close to the estrus period of dogs, and there are many newborn puppies).

So you must pay more attention to your dog's physical condition in these seasons, and keep your dog from contacting sick dogs, so as to reduce the chance of your dog getting sick.