fresh rabbit, chopped into chunks, look at dogs that are fed on tinned dog food, there glands get full up because the arse aint working the way it was made to, the anal glands are there for a reason, to help expel bones/hard matter, if they only ever expel soft, the glands fill up
dont know if a fert have these glands, but ferts, even kitts are meat/ bone eaters, not soft food eaters
They do have anal glands which can get impacted or even infected I had an oldie with a little bit of back end paralysis and his glands became infected. He had a course of antibiotics but after that his