You check the boy for bite marks.

Dr. Begely: Hum…. No bite marks. However, it's unlikely a bite mark would still show. Rabies has an incubation period of a pretty long time. It might have been a long time ago. Maybe he got bitten by a raccoon one-day or something in the backyard and was ashamed for playing with wild animals?
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Dr. Shelly: Being bitten by playing with raccoons? Come on! Be real. Who gets bitten by raccoons? Aren't they night animals anyway? Hum… I remember somewhere that you could get rabies from eating rabid meat. Maybe he did that at the farm?
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Which of these hypothesis is correct? They are definitely both possibilities. What do you think?

 Ask if he plays at night. There's no way you can get rabies from eating meat.

 Well, since there are no bite marks, it makes more sense that he contracted the disease another way. Ask what he ate during the visit to the farm.

 We should check both possibilities, there is no way to tell unless we find out both pieces of information.