WTF?! She's 15 months and this has only started recently. Instead of doing one big wee on a walk, the first wee is quite short and then she will either squat or cock a leg over any good sniffs she finds on the walk and pee on those a tiny bit too. About 5 or 6 times in a half hour walk I would say.
It's definitely not a UTI, as she has free access to the garden all day through a dog door and she can go hours without needing a wee at home.
Is it some kind of teenagery testosterone surge or something?!