
You can get things similar to something humans would use for a sprain. A gel or cream that can be massaged in , they are herbal and usually contain menthol, the only one that I can think of is Trainers Choice, don't know if they still make it, but I used to work with greyhounds and no greyhound kennel would ever be without it!
This may soothe and also help to heal the shoulder quicker.
Why not let them sleep in their normal bed?
Jo