Vets and YouTube suggest a collecting vessel that is narrow enough to slide between her back legs, short enough not to touch her when I slide it under, and long enough to collect something given that I can't see when it's in the right place,. Given how low she squats, and she's less than 10kg anyway, finding something suitable is a bit of a challenge.
I appreciate that vets can get samples in other ways, but regular urine tests are likely to be part of her future so we need a solution I can manage at home.
All ideas welcome, thank you from both of us!