Can Dogs Learn to Share?

I've been wondering: is it possible for dogs to learn to share?

More specifically, is it possible for Beatrice and Max to learn to share toys?

24 hours ago, I would have said "no." Then, yesterday afternoon, a veritable miracle occurred: Beatrice and Max played with Beatrice's blue monster toy.  Together. And without bloodshed.

When we adopted Max, his "foster mom" generously gave us all the toys she had bought for him, including a small KONG, a Nylabone, a rope toy, and at least 5 or 6 squeaky toys.

I knew to put Beatrice's toys away before Max arrived--she has a history of being..well...a bit territorial about her toys.  But I still decided to try spreading Max's toys out on the floor.  I thought, hey, maybe she won't act that way about toys that belong to another dog.  Besides, there are more than enough to go around--if one dog wants what the other dog has, I can just distract them with a different toy.

Wrong.

That first day, Beatrice tried to gather all the toys into a pile so that she could guard them like a dragon.  I realized that it would be a wise to put all the toys away before baby Max got pulverized.

But keeping all the toys put away was not an acceptable solution long-term.  Max was gnawing on the coffee table, the backdoor, my books, Husband's shoes, rocks, branches, pieces of paper, and only heaven knows what else.  I kept having to fuss at Max to quit chewing on things without being able to provide him with an acceptable substitute.  Besides, I wasn't happy to deprive Beatrice of all the toys that she loved playing with so much, and I can't imagine that Beatrice was happy either.  Even Husband mentioned that he was disappointed that Beatrice could no longer greet him at the door after work with a squeaky sheep in her mouth.  (It was so cute when she did that!)

So, I tried again and again to reintroduce the toys that I thought were least likely to cause an argument--the toys that didn't squeaky or hold a treat.  At the first sign of conflict, I'd put all the toys away again.

Beatrice eventually seemed to figure out that I wasn't going to let her get away with having ALL the toys, but she still wanted to guard whichever toy she DID have from Max. Meanwhile, Max was only interested in playing with whatever toy Beatrice had, and all my attempts to distract him with a different toy were failures.

Yesterday, when I brought the toys out, Beatrice immediately grabbed her beloved blue monster toy (which, as a result of her "love," no longer squeaks),  Max ran up to her, and I prepared myself to intervene.....but instead of trying to rip Max's head off, Beatrice starting playing with him....and I'm pretty sure a choir of angels started singing.  That's how relieved I was.

Maybe dogs CAN learn to share.  I certainly hope so, because Max needs something to do other than harass Beatrice and eat furniture....