The next day Anna whimpered as she woke up to a burning sensation in her loins. She whined a little as she felt a growing arousal, she could smell a male in the nearby house and tried to walk forward towards the doggy door again but found herself caught on the leash and barked loudly, trying to get the male's attention.
The smell and the sound of the barking dog managed to attract some other attention however. A dog sniffed at the ground where Anna had dug to get into the back yard the day before and pushed under it. He was a good sized lab that had been a teenage neighbor of the siblings that had always had a little bit of a crush on Anna.
As he smelled around the backyard, he could tell that the bitch in front of him was in heat and panting heavily. She looked back at him and whimpered a little as she moved into position and lifted her tail. She was still trying to process the memories from yesterday, but her instincts were now taking precedent as she let out a loud bark.
She wanted to have his puppies more than anything, and he moved forward and sniffed her hindquarters, his red rocket slipping out of its sheath as he did.