Hello & welcome from Canada. Glad to have you here. I checked your website - good looking pack you have & though I don't read your language, I truly enjoyed the photos.
Bungwa has a very dry mouth and I only managed to get a very tiny white patch on the test card but it was still sufficient to do the test with that. It only turns white when it's dry - the instructions are quite explicit. Of course as Pat says it could be a bad test form.
I live near the mountains in Colorado. There are some great trails with open space all around to let thme run around.
Gosh I'm so jealous!! We don't have any plasce we could let our pooches loose. I would love a big open space sans any basenji prey :) that way they'll come back