What type of pheromones does a female dog excrete while in heat?

During a female dog's heat cycle, she primarily excretes sex pheromones. These pheromones play a crucial role in attracting male dogs, signaling that she is in a receptive state for mating. The presence of these pheromones communicates to potential mates that the female is ready to breed, thus facilitating reproduction.

Sex pheromones are often species-specific and can influence the behavior of male dogs significantly, making them more likely to respond to the female’s signals. This is an essential part of canine reproductive behavior, ensuring the continuation of the species. In contrast, the other types of pheromones listed serve different purposes, such as marking territory or signaling danger, which are not relevant to the reproductive attraction that occurs during the heat cycle.