4 Year Old Female Husky Mix Help?

My 4 year old Husky mix Sweetie is a real sweetheart hint the name. She is a rescue dog, she is a Siberian Husky/ Alaskan Husky mix. She was a lead sled dog, and I am training her again for that position. But I am having a lot of trouble with her behavior. She as a lead sled dog is very dominate towards other dogs. She is great with my 7 month old Cockapoo puppy, when it comes to other dogs she does alright but with her dominate behavior she tends to frighten the other dogs (I’m worried that another dog will start a fight with her because they are scared or something). Sweetie gets along with other sled breed dogs obviously it is just with other breeds that she seems to have trouble with. Is there anyway to correct this dominate behavior of hers?? Sweetie also has a very sensitive stomach. Is there any type of dog food that might be good for her?? She isn’t my first dog I’ve just never owned one with her sensitive stomach nor one as stubborn as she. Any help you can give is welcomed.