It could be one of many things such as his bladder or urethra, a UTI, kidneys, prostate it is important he have more indepth tests done as to not worsen his condition especially since it has be going on for 3 months that is way to long and could be fatal for your puppy - he must be sad and uncomfortable you must take him to the vet or give him to someone who will take care of him. The following link may offer some information for you:
http://www.medi-vet.com/UrinaryIncontinence.html Further to the above answer which is very correct, it may be simply a behavioral problem caused by a traumatic experience or fear if the dog is routinely punished, shouted at or attacked by another pet.
Also check for any plant or home cleaning liquids that the dog may be licking. Many toxics may produce that reaction.
Copious is an adjective.
Cherry blossoms fell in copious amounts on the breezy day. Copious is an adjective meaning abundant or plentiful.
When you get to college you have to take copious of notes
We consumed copious amounts of samples at the garlic festival.
Copious means "large" or "abundant" - if you have copious blood loss, it means you have lost a lot of blood. (Usually through serious injury.)
I passed the test because I took copious notes.
China has a copious amount of people.
She was very hyper due to the copious amounts of coffee she had consumed. hope that helps :)
" I had to use copious amounts of whipped cream to cover the cake"
fearful
a lot
I always take copious notes in my classes so that I have a lot of information to study from.