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I'm glad he is on medicine and the loxicom would help with any pain, inflammation or fever while the antibiotics should treat most infections.
If he is not drinking, I would want to ensure there is some water in the food he is eating e.g. wet food vs kibble and that his gums are wet (dry gums can indicate dehydration).
While anal glands can burst, this is not something we would want to happen. So, ideally we would have them examined and if they are full or infected they should be squeezed.