My dog moves slowly and won’t stand; its hind leg hurts when it jumps — blood and X-ray tests were done but we still don’t know what’s wrong

Hind-leg pain and slow movement usually come from trauma, bone problems, or nerve issues. With no trauma and clear bones, nerve damage or ligament problems (neuritis, ligament injury) are likely. Get further tests to find the cause; the vet will also review diet, habits, and environment for neuritis triggers.