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At 3 months old , Tana , a distaff French bulldog was brought to a veterinary for a routine vaccination when specializer there became alarmed by the size of it of the dog ’s clit , which they aver was " larger than normal . " Tests revealed the first - ever sex reversal in this dog breed .
The pup had what is called cryptorchid nut . Her sex chromosomes said she was distaff ( male person have one X and one Y while females have two X chromosomes ) , but the pup had masculine gonad ( cryptorchid orchis ) as a result of other genes in her body responsible for the establishment of testicles even in the absence seizure of a Y chromsome .
Tana was just a puppy when doctors noticed she had testicles.
Genetic alteration of the reproductive system or intimate reversal " has been discover in many specie , such as Capricorn , pigs , horse and even human beings " , said lead researcher Marcos Campos , of the CEU - Cardenal Herrera University and director of the Reprovalcan assist procreation center field for small animate being .
This revision , which has also been described in another 18 breeds of andiron around the world , is " rare but it can occur " . gender reversal causes sterility and , over the farsighted terminal figure , may predispose the fauna to pathology such as infections or tumours of the gonads , " since this is not a normal genital " , the vet explicate .
The doctors receive that Tana ’s urethra ended in the bladder , and the button , which was just under a half inch ( 0.8 centimeters ) long , contained a penis os , which predispose it to urinary infections that would likely cause the dog to be infertile .
To prevent Tana from suffer any medical complication , the doctors decided to surgically desex Tana , move out her genitalia .
" The pup is now in perfect health , " Campos said in a statement .
The veterinarians suggest that owners of epicene puppies , like Tana , should not be allowed to take part in multiply programs , because it is likely that at least one-half of their litters will be carriers of the mutant genes . The canine intersex ’s sib should also be barred from breeding political program , they say , since they too may be carrying the mutations .
The study is published in the journal Reproduction in Domestic Animals .
