Place chicken in a saucepan, add water, and bring to a boil.
Simmer for 20 minutes. Take chicken out of the water and set aside.
While the water in the saucepan is still boiling, add the macaroni. Simmer for 10-12 minutes, adding in the carrots and celery in the last 5 minutes.
While waiting for the macaroni to cook, cut the chicken into cubes or tear into shreds using two forks.
In a skillet, melt the butter then sauté the garlic, onion, hotdog, and chicken.
When the chicken have slightly browned, add the red bell pepper and sauté all the ingredients in the skillet together for another minute.
Transfer all the ingredients in the skillet carefully into the saucepan.
Add milk and stir. Add salt and pepper to taste.
For more flavor, add one chicken broth cube and stir until dissolved.