I am sorry for that, but there isn't anything to do.
Yes. See a vet immediately.
Nothing good. You should take your dog to your veterinarian and let him know what is going on. My top concerns would be chronic nasal bacterial infection, nasal fungal infection, nasal cancer or bleeding disorder.
A good treatment for dog allergy is nasal spray that will relieve your nasal sensitivity.
Surgical intervention (removal of tumor if possible) or conservative treatment (pain management) If your dog has a rectal tumor you need to consult your local vet.
Take the dog to the Vet...
Maybe a tumor, not good!!
tumor
It depends on the dog.
Chances are, the lung tumor is actually causing your dogs cough. If your dog has gotten a secondary illness due to the tumor, or the tumor is damaging the lung tissue more, then you need to consult your veterinarian about the best way to proceed. At the very least, they can prescribe medications that will make your dog more comfortable. I wish you the best of luck.
There is no average life expectancy for a dog with a tumor in the fore brain. The length of remaining life is determined by the size of the tumor, how aggressive the tumor is, and when the tumor is diagnosed.
If the dog has a Canine Transmissible Venereal Tumor (CTVT), one of the only two transmissible cancers, then it is possible for the dog to infect another dog by touch. It is not, however, transmissible to humans.
The average survival time for dogs with a malignant tumor is 2 years. The closer the tumor is to the paw, better the chances of recovery.