A. I'd also add that the elevated protein level could be due to dehydration, if he's vomiting and/or not drinking sufficient water (or if he's urinating frequently).
A. The first thing I see is that both the AST and the ALT, which are enzymes produced by the liver, are elevated. His glucose is also remarkably low, and while that could be an artifact of how the sample was handled I'm very worried about his liver. If his platelet reading is 149,000, that's pretty much normal. Total calcium is also normal, and unfortunately I'm not familiar with the abbreviation "PSL", so I can't help you with that one.
If your vet has not recommended it already, I think the next steps need to be imaging (ultrasound) to look at the liver and a test called a bile acids test, to determine liver function. I'm not sure what your vet is trying to treat with antibiotics alone, but I'm worried that your dog needs more care, especially if he's not improving on the treatment. If you have access to a veterinary internal medicine specialist where you live, you should consider scheduling an appointment. If you want to talk further about the specifics of your dog's case I'd be happy to consult with you.
A. Different machines and different labs can all have different reference ranges but from what you have listed these are fairly non-specific changes and do not conclusively diagnose any condition; retesting in 7-10days will help to chart any increases/decreases and any developing or resolving issues. You do not mention a white blood cell count and it is hard to advise clearly in this case; please request a consult if you wish to discuss this further
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