1. Best Commercial Dog Food:

Royal Canin Jack Russell Terrier Adult: This breed-specific formula is tailored for Jack Russells, supporting their energy levels and muscle mass.
Blue Buffalo Life Protection Formula: Offers high-quality protein and whole grains, ideal for active breeds like Jack Russells.
Wellness CORE Grain-Free: Rich in protein and free of grains, good for a high-energy dog like a Jack Russell.

2. Best Homemade Food for Jack Russell Terrier:

Lean Proteins: Chicken, turkey, and beef, well-cooked without seasoning.
Carbohydrates: Brown rice, quinoa, and sweet potatoes.
Vegetables: Carrots, spinach, and green beans (cooked and mashed for easy digestion).
Fats: Olive oil or fish oil can be added in small amounts.

3. Best Dog Food for Jack Russell Terrier with Allergies:

Hill’s Prescription Diet d/d: Specifically designed for dogs with food sensitivities and allergies.
Natural Balance L.I.D.: Limited Ingredient Diets that minimize potential allergens.
Wellness Simple: Offers a single source of protein and easily digestible carbohydrates.

4. Best Food for Jack Russell Puppy:

Royal Canin Jack Russell Terrier Puppy: Formulated for the specific needs of Jack Russell puppies.
Blue Buffalo Wilderness Puppy: High in protein and enriched with DHA for brain development.
Nutro Ultra Puppy: A nutrient-dense food with a balance of proteins and fats for growth.

5. Best Dry Dog Food for Jack Russell:

Orijen Original Dry Dog Food: High in protein and grain-free, perfect for the active Jack Russell.
Taste of the Wild High Prairie: Offers high-quality ingredients with real meat as the first ingredient.
Canidae PURE Grain-Free: Limited ingredient diet that is grain-free, ideal for dogs with sensitive stomachs.

6. Best Dog Food for Chihuahua Jack Russell Mix:

Royal Canin Small Breed: Suitable for small dogs like a Chihuahua-Jack Russell mix.
Wellness CORE RawRev: High in protein and includes freeze-dried raw meat.
Nutro Ultra Small Breed: Specially formulated for small breeds, ensuring balanced nutrition.

7. Human Food That Jack Russells Can Eat:

Lean Meats: Plain, cooked chicken, turkey, and beef.
Vegetables: Carrots, peas, green beans, and sweet potatoes (cooked).
Fruits: Apples (without seeds), blueberries, and bananas.
Grains: Brown rice and oatmeal (plain and cooked).
Dairy: Small amounts of plain yogurt or cottage cheese.
Always consult your vet before making significant changes to your dog’s diet, especially if your Jack Russell has allergies or other health concerns.