Why are your in heat chihuahuas nipples swollen?

When a female Chihuahua is in heat, her body undergoes hormonal changes that can lead to the swelling of her nipples. This swelling is a natural response to the increase in estrogen and progesterone, preparing her body for a possible pregnancy. Additionally, the nipples may become more prominent as part of the overall reproductive cycle. If you have concerns about your dog's health, it's always best to consult a veterinarian.