Deuteronomy 24:1    When a man hath taken a wife, and married her, and it come to pass that she find no favour in his eyes, because he hath found some uncleanness in her: then let him write her a bill of divorcement, and give [it] in her hand, and send her out of his house.

Clear instructions from the Master Teacher:    Mark 10:2    And the Pharisees came to him (Jesus), and asked him, Is it lawful for a man to put away  [his] wife? tempting him.  
     10:3    And he answered and said unto them, What did Moses command you?  
     10:4    And they said, Moses suffered to write a bill of divorcement, and to put [her] away.  
     10:5    And Jesus answered and said unto them, For the hardness of your heart he wrote you this    precept.  
     10:6    But from the beginning of the creation God made them male and female.  
     10:7    For this cause shall a man leave his father and mother, and cleave to his wife;  
     10:8    And they twain shall be one flesh: so then they are no more twain, but one flesh.  
     10:9    What therefore God hath joined together, let not man put asunder.  
     10:10    And in the house his disciples asked him again of the same [matter].  
     10:11    And he saith unto them, Whosoever shall put away his wife, and marry another,     committeth adultery against her.  
     10:12    And if a woman shall put away her husband, and be married to another,
    she committeth  adultery.  

Deuteronomy  24:2    And when she is departed out of his house, she may go and be another man's [wife].  
 24:3    And [if] the latter husband hate her, and write her a bill of divorcement, and giveth [it] in her hand, and sendeth her out of his house; or if the latter husband die, which took her [to be] his wife;  
 24:4    Her former husband, which sent her away, may not take her again to be his wife, after that she is defiled; for that [is] abomination before the LORD: and thou shalt not cause the land to sin, which the LORD thy God giveth thee [for] an inheritance.

 
I am told that if a pure-breed female dog is impregnated by a male, not of her breed, she retains what defiles following litters, so is worthless for future breeding