your dog isa messed up in the head
These are one of the cues that indicate a dog is in heat.
Yes, I think he can get a female dog pregnant with 1 testicle.
When it get swollen it might be that she is pregnet
Your dog should be examined by your veterinarian. There is no way to diagnose your dog over the Internet.
Your gonna have to feed the pups yourself if you don't your pups will die. If the dogs breast are swollen then your dog is sick.
It is normal for one testicle to be a little bit bigger than the other. This is no problem. If one is much bigger, or feels swollen, or has a lump on it, then you should see a doctor as soon as possible. See Related Links below.
Pregnant?
Take it to the vet.
No, because this would mean that the dog would still be able to sire young.
Processed dog foods are classified into puppy and adult food. You should give the adult dog food then. Also, homemade dog food can be given to adult dogs.
Yes, you may have cancer?