I was a veterinary assistant for around 5 years, and I just want to stress that chocolate can most definitely be toxic to dogs. Dark chocolate, and especially baking chocolate are much more toxic than milk chocolate, and it also depends on the size of the dog. And some dogs are just plain more sensitive to it than others.
Also, the doggie ice cream is a great treat, my dogs love it! But I cut it in half for my smaller dog, or it upsets her tummy. Another great sweet treat is marshmallows. Most dogs love them, and it's hilarious if they get them stuck on their teeth.