You need to be careful of choking when they eat from the feet first, especially when he starts to eat fuzzys (it's something to do with the way the hair runs, can get caught - so i was told).
Him eating backwards might just be a one off.

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True.Thet eat it head first (usually) so the fur and legs,ears etc are pushed backwards.Nothing to worry about though everyones has done it at one stage or another.
I have also heard that if they eat it backwards that it can be a sign that the food item is to small.