For the past 2-3 months I've noticed that Milo's bum really stinks once a month. He licks it and there's brown liquid oozing out of his bumhole and a bit stuck on his tail. The smell is terrible when you get about 50cm distance of him.
Normally when I wipe his bottom with tissue, he is ok with it. But whenever I wipe his bum when this happens, he runs away.
Does this call for a vet trip? Does it have anything to do with his anal glands?