The odds are against it but you never know. The male that has only one testicle down, should be neutered for his own health's sake as the testicle that retained inside of him will most likely turn cancerous and cause his death eventually. This condition is also an inherited trait and can be passed along in the gene pool, so you would not wish to breed an animal with this condition, mono orchid-ism is what it is called I believe (meaning one testicle in Latin).
your dog isa messed up in the head
Yes, I think he can get a female dog pregnant with 1 testicle.
No, because this would mean that the dog would still be able to sire young.
Maybe, but I believe they can only mate with one dog at a time.
Take the dog to a vet, they could tell you.
Yes, as long as the testicle is functioning properly then you can reproduce with one testicle.
Yes, he has only one testicle.
He was bred as a dog for races and for hunting.
The Papillon (or butterfly-eared dog) was bred to look pretty for aristocratic ladies who wanted a lap dog.
No.
no
yes you can (I did)