Then something has obviously gone wrong with the neutering.
If your male dog is not already neutered, neuter him.
He's horny
A neutered dog can achieve an erection. It has nothing to do with sexual urges. General excitement, such as a new person in their home can cause this.
A dog can be neutered at any age after 6 months.
The risk of a dog developing certain types of cancer is reduced if the dog is neutered.
The sterile dog can not cause/have puppies, either because it has been spayed/neutered, or because of genetic issues.
no
They should both be neutered! Aren't there enough unwanted puppies out there?!
a neutered dog
I would take to a vet right away or you wont have a dog
Yes. A neuter dog's penis is still intact, and that is what causes the tying, although neutered dogs generally don't have the drive to do so.
He will eventually, my dog is six and he was neutered. Give it a couple of weeks.