* Vulva swelling: The vulva, or external genitalia of the dog, will swell and become red and engorged. This is the most obvious sign that a dog is coming into heat.
* Bloody discharge: A bloody discharge will also be present from the vulva. The discharge may be light or heavy, and it may vary in color from pink to red to brown.
* Increased urination: Dogs in heat will often urinate more frequently than usual. This is because the hormones that are responsible for heat also cause the kidneys to produce more urine.
* Flirting behavior: Dogs in heat will often flirt with male dogs. This behavior may include wagging the tail, arching the back, and presenting the vulva.
Behavioral Signs
* Increased restlessness: Dogs in heat may be more restless than usual. They may pace back and forth, whine, or bark.
* Loss of appetite: Some dogs may lose their appetite during heat.
* Aggression: Dogs in heat may become aggressive towards other dogs, especially male dogs.
* Escape attempts: Dogs in heat may try to escape from their home or yard in order to find a mate.
If you think your dog is coming into heat, it is important to take her to the vet for a checkup. The vet can confirm that your dog is in heat and rule out any other medical problems that could be causing the symptoms.