We occasionally notice a fishy odor from our Sam. I'm positive it's coming from his anal glands. At first, I thought the glands were impacted, but he's not showing any symptoms aside from the odor. His stools are normal, he doesn't bite his anus, he doesn't rub his bum on the floor, and the glands don't feel hard. He also does not struggle to defecate. The odor comes and goes every couple days. And it's very strong.
I'll have our vet check him out next week. Curious if anyone has had this experience.