For some dogs, regular expression of the anal glands causes inflammation, which can cause the glands to become impacted due to swelling in the opening to the gland. That’s why it is not recommended to express them if it is not needed. Feeding the dog something to bulk up the stool expresses the anal glands in the most natural and least irritating way, from the inside.
There are more ingredients in THK Love that Lily could be reacting to than just the beef. Hopefully, you can find a LID food that she does well on and start adding ingredients one at a time to figure out what she is reacting to. While I don’t like Hill’s and the like, they are an easy way to start an elimination diet.
