Hi all - my poor little Marcel - something is wrong

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Sunday I noticed he was limping in his right front - we inspected all over but found nothing. Monday morning it was still going on, so we went to the vet. Because there is seemingly no explanation for the limp, we thought it best to check for Valley Fever and do a super comprehensive blood panel.
He's also had some weight loss - which I started noticing about 3 weeks ago. I haven't changed his diet - and he's been eating the exact same amount as always.
Then yesterday afternoon, I noticed he was starting to limp on his back left. I left a message for the vet. I expect I'll get the bloodwork results today or tomorrow.
Does anyone have *any* other ideas....?
Please keep him in your thoughts

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