Here's a breakdown of what could be happening:
* She's not in heat: The most common reason is that she's not in her fertile period. Dogs only come into heat for a couple of weeks every 6 months or so.
* She's not receptive: Even if she's in heat, she might not be receptive to the specific male. She could be picky about who she mates with.
* She's uncomfortable: The mounting might be painful, she might be feeling stressed, or the male could be too aggressive.
* She's not physically ready: Even if she's in heat, she might not be physically ready to mate.
It's important to understand: It's not unusual for females to pull away during mating attempts, even if they are in heat.
What to do:
* Respect her signals: If she's pulling away, stop the mating process immediately.
* Don't force her: Forcing a dog to mate can cause injury and distress.
* Consult a vet: If you're unsure about your dog's reproductive cycle or if you notice any unusual behavior, consult a veterinarian.
Remember: Responsible dog ownership includes understanding canine behavior and ensuring that breeding is done ethically and safely.