Though small, dogs of this breed are quite active, so the Bedlington Terrier diet will need to be rich in nutrients that help it sustain its high energy level. Like that of all breeds, Bedlington Terrier food will need to contain plenty of animal proteins and carbohydrates for energy, vitamins and minerals for digestive and immune health, and omega fatty acids for coat and skin wellness.
This means the best food choice for BTs is the premium dry kind. This high-quality kibble, while more expensive and difficult to obtain, has balanced portions of the above-listed ingredients your BT will need to maintain its health in the long term. Cheap, generic dog food is not recommended for this breed, because it contains mostly empty filler ingredients that are not healthy, are harder for the dog to digest, and may even shorten its lifespan if eaten on a daily basis.
Blue Buffalo, Royal Canin, and Taste of the Wild are three recommended brands that have excellent lines of premium dry food.
And yes, this premium food is pricey--but the good news is your Bedlington Terrier won't eat a lot of it at once. The typical adult BT, depending on its size, age, and activity level, will only need about 1½ cups of premium dry food per day, divided into two meals. BT puppies, again depending on age, will need a bit less: about one cup per day, divided into three meals (not two) until six months of age.
For further details on feeding a Bedlington Terrier from puppyhood through maturity, see the following:
Bedlington Terrier Feeding ChartDog AgeDog WeightFood TypeAmountFrequency2 Months3 lbsDry (Puppy formula)6-8 pieces3x/day3 Months6 lbsDry0.2 cups3x/day6 Months12 lbsDry0.35 cups3x/day8 Months16 lbsDry* (Puppy/Adult)0.6 cups2x/day11 Months+20 lbsDry (Adult formula)0.75 cups2x/day*--Around this time, transition to adult food by first mixing in a bit of adult formula with the puppy formula. Over the course of a week, with each meal add a bit more adult food to the mixture, until the dog is eating it entirely.
If possible, try and stick to the above-listed portions. If constantly overfed (and under-exercised), your BT can become overweight--and a fat Bedlington Terrier will have joint, digestive, and breathing problems, not to mention a potentially shortened lifespan. You can help control your BT's weight by having consistent feeding and exercise schedules, by not feeding the dog table scraps, and by not leaving food in the dog's bowl all the time, thereby allowing it to eat anytime it wants. It's better to put your BT's bowl down only at mealtimes, then pick it up a few minutes after the dog begins eating.
If you're worried your Bedlington Terrier is overweight, give the dog this simple test: run a hand along its side, and if you can't feel any ribs, it's diet time. Reduce the dog's daily food consumption by one-fourth, and add an extra walk, jog, or play period to its daily exercise schedule.