Our wiener dog is the same way, and she is a master beggar. We of course cannot give her anything with chocolate and she feels that this is extremely unfair of us.
One of our previous wiener dogs found a bag of mini Hershey bars while we were out. He got into it and ate all the candy. When my wife got home she found chewed up wrappers and followed the trail back to the kitchen where he was looking bad. My wife carried him outside and put him down in the grass. He fell on his side and then got up and barfed out a bunch of wrappers and chocolate. Then he ran off like everything was fine and went potty. After that he acted like nothing had happened and went the rest of the day with no problems.
Another time he pulled the table cloth off of our dining room table and started gobbling down an entire batch of carefully frosted Christmas cookies. My wife heard the commotion, but he managed to eat about a dozen of them before she was able to get them away from him. He managed to keep his weight under control because he was not a pig with dog food. He lived to be 17 years old, and was a very special dog despite his sweet tooth.
I had a boxer. Had been making all different flavors of fudge to put in tins for Christmas gifts. Chocolate...with and without nuts, peanut butter, and vanilla/chocolate layered. Left it all setting out on the counter in the kitchen and went to work and was going to finish when I got home. When I returned it was all gone, every single bite. And the dog wasn’t looking so good. lol I rushed her to the vet where they gave her some kind of med to make her throw it all up....then she was fine. I learned my lesson about leaving ANYTHING out.