No bubbles to be burst, but honestly growing up we have had, at various times, a Cocker Spaniel, German Shepherd, Bichon Frise, Maltese, and various mixed breed dogs (both large and small) and this is the first time I've personally ever seen this type of obsession with paper (I'm in no way suggesting that other dogs can't or don't have it too!), but it really does seem to run rampant among Havanese which I just happen to find really intriguing.
All our dogs have had their own little quirks: the German Shephard ate my grandma's curtains and she (the dog, not my grandma) could pop locks on doors and turn door handles and get into parts of the house she wasn't supposed to; one of our mixed breeds could scale fences and was impossible to contain in a yard; the Bichon was OCD about his toys; and our tiny mixed breed never barked and refused to have anything to do with toys after the first time he discovered the squeaker in one of them - it scared him and after that, that was it...no second chances!
With Brody, it's paper. When Brody spots a piece of paper his eyes immediately light up with pure joy. He's not even really huge into just shredding for shredding sake - there is a whole process...he carries it around, he throws it in the air and chases it, stalks it, hunts it. He does eventually gets down to the business of shredding (which is usually when it becomes "game over" for him because he decides to eat it at that point too). He savors the whole paper experience!
I do keep my bathroom door shut, but he does pretty much leave the toilet paper roll alone now, so the roll is back on the holder instead of up on the counter. He WILL go into garbage containers and drag out paper, but does reluctantly stop when I remind him he's not supposed to be in there (usually after he unsuccessfully pretends he can't hear me)! My paper bin/garbage that I have by my computer is still barricaded off with rubbermaid lids so he can't get into it because it's still too much of an irresistible temptation for him!
Thankfully, he gets over me taking stuff away from him pretty quickly. My mom and dad's toy-obsessed Bichon (obsessed on an OCD scale) would destroy his toys, but when you took one away from him after it became unsafe, he'd NEVER forget where you put it. He'd lay in front of where it was taken to and cry for days! Throwing them out was this huge process that involved stashing it in a cupboard and then trying to sneak it out to the garbage when he wasn't around (which basically meant he had to be out of the house). Even months later, if you happened to go to a cupboard one had been stashed in he'd start up with the crying again wanting his toy back.
I must confess that I do find it interesting that the love of all-things-paper is so prevalent among Havanese. It's just one of those curiosities that intrigue me.