If he is lifting his leg, at the very least he is in discomfort, but most likely in pain. Dogs hide pain very well. Katie limps her left rear leg after playing too hard. So I know she cannot walk more than one mile or play too long at the park. The vet does not need to xray to diagnose LP, but still should get that xray to rule out anything else too.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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