Pets are a lot like children, in that you never know what is going on in their minds, and they look at things much differently then we do, as humans.
I had one beautiful Blue Merle Collie, and when I was out in the garden planting flower bulbs, I happened to turn around and noticed that my collie, who was out there keeping me company, had come along behind me and dug out every single bulb as soon as I planted it.
I had to go back and plant each little flower bulb for the second time, while making sure that my Collie didn't come along and dig them out again.
I was really upset, but then I realized that dogs don't plant a flower garden, they dig holes to bury their bones and other "goodies".
So, to my Collie, I was obviously out there burying something that would be good to dig up and eat later, and he was probably very disappointed as he dug each one up, and only found a flower bulb !