Princess has this problem, sometimes she breaks out in a rash on her wee wee area too. She's had numerous skin cytologies done & it always comes back as some sort of bacteria they can get from grass. Vet told me it happens bc she squats to pee & touches grass, so to wash her every time we come back from being outside. I rinse her bottom & wash their paws every time after their walks & it cleared up. All that pollen is also horrible right now here, their eyes are weepy & eye boogers galore! Even Gerber water, which worked wonders is not working anymore.