My mom's little rotten boy, Toby, went to the vet, today, for a checkup. He's been feeling iffy lately, and his ears are bugging him, so she got a full blood workup and urinalysis done. Poor guy has a mild ear infection, and a UTI. His bloodwork looks utterly fantastic. All of his values are great. Toby will be 14, in May[

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The only thing I thought was strange is that he has ketones in his urine. I've never heard anybody say it. The vet asked if he eats a lot of protein, and mom said he gets some carbs (he does, but only about 30%). I told her that he eats a lot fewer carbs than a dog food dog would. She says it's fine, but wants a recheck in 3 months
Anybody else had that show up?