Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
At this point, re-exam and an x-ray.
A typical strain / sprain - should be done in a week.
If this has now been going on for 7 weeks - a repeat examination and x-ray would be indicated.
Thanks. We did not have him x rayed as two or three days later, he could run. While still limping when walking.
Initially - I often do not x-ray them....
As you did not - that is common
But when it has gone on this long- we should at least check...