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Hello, this is Dr. Jess. I am very sorry to hear about Tux. I am also sorry no one replied to your post before now.
Does he have an actual fracture in a vertebrae? If that is the case, then a cart may benefit him in the future, but until the bone heals, he needs to move as little as possible. As far as a brace goes, whether or not it would be effective or tolerated depends on where in the neck the fracture is located- your vet should be able to tell you whether or not this is something that would help him, or if it is even possible. Have you discussed these questions with them?