It could be nothing (a mildly elevated BUN can be caused by dehydration).
An untreated UTI may affect kidney values.
Tick disease and lepto can cause this but he should have more symptoms if that is the case.
High rotein diets do increase BUN.
Kidney infection (but they tend to feel bad with that).
Old kidneys / kidney failure - but there are lots of options.
Chronic use of meds that are hard on the kidneys.
Anything making the bladder unhappy (stones).
There are a lot of possibilities. Most are vety treatable.
Don't panic.
What food is he getting? Treats?
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