In the early stage of pregnancy, the color of the dog's nipple will not change much, but with the continuous development, the color of the nipple will become more and more obvious, the color will become darker, and even turn brown or black.
In addition, in the late pregnancy, the nipples of dogs will become more hypertrophy, increase in number, showing an obvious convex shape. This is a sign that the dog is ready to breastfeed.
2. Changes of hair around nipples
The hair around the nipple of a pregnant dog will also change. At the beginning of pregnancy, the hair will not change obviously, but with the deepening of pregnancy, the hair around the nipple will gradually become thinner to facilitate the puppy to find the nipple. In addition, the dog's nipple will be bitten a lot after delivery, which will also cause the surrounding hair to fall off easily.
3. Changes of nipple distribution
Normally, the nipples of adult dogs are distributed in two rows, one on each side of the abdomen. However, during pregnancy, the number of nipples in dogs will increase. Often it will increase from four to six, and some even reach eight. This is due to the influence of pregnancy hormones, which makes dogs produce more milk and can better meet the needs of puppies during production.
4. Other performances
In addition to the changes in the nipple itself, pregnant dogs will have other performances. Some dogs dig on the ground, trying to build a comfortable delivery room; Some dogs also have nipple discharge and weight gain. However, it should be noted that not all dogs will have these manifestations, which does not mean that dogs are pregnant abnormally.