Second Breeding



In Dogs

This is my female's second breeding, her first was with an unfamiliar dog and everything went fine.  She was 2 and a half yrs old then.  I bought my own male and they have grown together, i skipped her next heat,  and then the next one came 1 month late and now each time my male mounts and when he is about to penetrate she screams and trys to attack him, even though she stands for him.  This is not his first mating, he know's his business.  I have muzzled her, held her, massaging her.  But at the point of penetration she act's like it hurt's.  What could be wrong?  

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