Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to keep a pitbull [title] Choose the right food. [step] Pitbulls are high energy dogs, which mean they need a lot of food. Choosing the food with the proper ingredients is equally as important as making sure your dog gets enough food.

Ending1: To ensure your pitbull consumes enough food, consult your veterinarian first. You can also watch your dog in a dog park. Ending2: Your pitbull needs high calcium, potassium, and iron. [substeps] Pitbulls, like other animal breeds, are not typically highly nutritious sources of protein. Ending3: The best foods for your pitbull are leafy greens and fresh fruit. [substeps] Choose foods that are low in fat (such as salmon, tuna, mackerel) and high in protein. Ending4: The better nutrition your pitbull has, the happier they'll be. [substeps] Ask your vet what food is best for your pitbull.

Answer format: ending1/ending2/ending3/ending4