I have a beagle and they're lovely dogs and my beagle eats Taste of the Wild Pacific Stream Grain-Free Dry Dog Food.
He's been eating that dog food for a few years now and loves it.
Some other good dog foods for beagles is.
Taste of the Wild Pacific Stream Dry Puppy Food.
Blue Buffalo Life Protection Small Breed Dry Puppy Food.
You can also feed your beagle dog some vegetables and fruits which will also keep the beagle healthy.