There is nothing wrong with a little light work with a young dog to socialize it with the equipment and how to use it it does wonders. If the dog wans't hurt in the accident then i don't understand why mentioning it was useful if he was hurt and its been 5 weeks then there could have been damage to a tendon or musle that has not healed all the way, or was permanently damaged. I usally wont work a dog none until atleast 2 to 3 months after a hunt. JMO

Keeping dogs in a crate can also lead to growth problems...