Hi Risa, you might want to put the dogfood up somewhere Raine can't reach it, or make that area of the house off-limits to him.
Dogfood is not good for rabbits, they dhouldn't have anything that contains meatproducts, since those proteins are very hard for them to digest. He may not show problems right now, but it can lead to GI , liver, or kidney problems later on.
This is what Susan Brown, DVM wrote about it:
Is it bad for my bunny to snack on dog or cat food?
Yes, it is very dangerous for a rabbit to snack on dog or cat food. These foods are designed for carnivores not for herbivores. They are high in protein and fat as well as carbohydrates in the form of grains, usually corn. Although rabbits can eat small amounts of dog or cat food and appear to be normal, there can be insidious changes that take place over time. Excessive levels of protein can lead to kidney damage; excessive levels of fat and grain-based carbohydrates can lead to obesity. However, by far the most dangerous side effect in rabbits that eat dry dog or cat food is the disturbance of the normal intestinal flora that will ultimately lead to intestinal distress and death. We have seen rabbits become seriously ill and some die within 24 hours of eating dog food due to acute intestinal disorders. Please keep all dog and cat food out of the reach of your rabbit!
So you might want to find a way to keep him out of the dog food ASAP.