Yup. I USED to keep the dog food container outside on the front porch, until one day I heard this long THUNK and something spilling. I ran outside, and my mare had left her grass and climbed onto the porch only to knock open the dog food container (by throwing it to the ground and pawing it until it opened) and ate a few days worth of kibble O_O
And no, it isn't uncommon for her to be in the front yard ;) It's paddock sized, so when the grass grows up, she goes in and mows it back down for us

Awesome pro to having a "backyard" horse. OP, your colt is freaking adorable!! But we should probably keep our dog food better put up from now on