Very smart dogs. As for that holding the kife thing, it's hard to see from the picture but you didn't have their dew claws removed by any chance did you? The dew claws are basically their thumbs so, yeah, if you had them removed I highly doubt they will ever be able to hold a knife with any sort of proficiency.
Good call! Half beagle and half fox terrier. Good jump dogs and don't run ten miles like beagles.
...but you didn't have their dew claws removed by any chance did you?
You are 2 for 2! We did, plus bobbed thier tails. Here they are before the operation: