The best dog food for working dogs is high in protein and fat. Purina Pro Plan Sport 30/20 is my top pick. It has 30% protein and 20% fat. I've used it for my own dogs and seen great results.
Working dogs burn a lot of calories. A herding dog running all day might need 2000 calories a day, compared to a couch potato dog that needs 800. So you need food that packs energy. That means high fat for sustainable energy and high protein for muscle repair.
I remember my lab, Rex, when he was working on the farm. He would plow through three bowls a day. We started with a cheap brand, but he got tired quickly. Switching to Pro Plan Sport made a huge difference. He had more energy and his coat looked better.
Now let's compare some brands. You can check my full dog food reviews for more details, but here's a quick rundown. Blue Buffalo Wilderness has 34% protein but only 16% fat. That's okay for moderate activity but not for extreme work. Also it uses LifeSource Bits, which are fine but some dogs pick them out. And it's expensive. Not worth the price for working dogs.
Eukanuba Performance has 26% protein and 18% fat. It includes glucosamine which is good for joints, but for a young working dog the protein is too low. I wouldn't recommend it for high-energy dogs. It's more suited for less active pets.
Another option is Victor Performance. It has 33% protein and 20% fat. It's a good budget alternative. I've seen it used by many working dog owners. It's made in the USA and uses beef and chicken. My only issue is that some dogs get gas from it. But overall solid.
In my test Pro Plan Sport gave the best endurance. During a 10-mile run dogs fed on it recovered faster. Blue Buffalo was okay but dogs seemed hungrier sooner. Victor was close but the gas issue was annoying.
Let's talk calories. Pro Plan Sport has about 450 calories per cup. Blue Buffalo Wilderness has around 430. Victor Performance has 460. So Victor actually gives more calories per cup, which is good for a working dog. But recall the gas issue.
For feeding I suggest 2-4 cups a day depending on weight and activity. Always have fresh water available. Split into two meals to prevent bloat. Bloat is a real risk for deep-chested dogs.
Don't believe that high protein damages kidneys. That's a myth if the dog is healthy. Working dogs need that protein.
Some people ask about grain-free. I don't think it's beneficial. Grains like rice and oats provide easy energy. Unless your dog has a specific allergy stick with grain-inclusive. The grain-free trend is mostly marketing.
Also avoid foods with corn soy or animal by-products. Not all by-products are bad but you want quality ingredients. Look for named meat like chicken beef or fish.
I once tried a trendy raw diet for a week. It was a mess. My dog loved it but the prep time was insane. Not for busy working dog owners. Freeze-dried raw is easier but costs a lot. Stick with kibble.
If you have a working puppy find a puppy formula from the same brand. Pro Plan has a Puppy Sport that works well. The Complete Guide to Growing Strong covers how to pick the best food for your young dog. It has more calories and DHA.
Choose a food with at least 30% protein and 18% fat. For a full breakdown of what to look for, read my ultimate dog food buying guide. Purina Pro Plan Sport is the best overall. Victor is a close second if you're on a budget. That's my advice from years of testing. Good luck with your working dog.