Symptoms of Labrador in estrus:

1. The private parts of a female Labrador in estrus will turn red and appear obviously swollen, accompanied by blood. Liquid comes out.

2. Female Labradors will be emotionally unstable during estrus, often restless, and like to make humming sounds.

3. Female Labradors will drink a lot of water because they are in estrus, thereby excreting more urine and leaving their own scent to attract male Labradors.

4. Female Labradors will be affected by the smell of male Labradors around them. They always want to go out and can easily run out.

5. During estrus, male Labradors will have behaviors such as crawling on the crotch, hugging the legs, and like to get close to the female dog.

6. Male Labradors in estrus are very aggressive towards strangers and other male dogs around them.