Sorry that you weren't able to visit a nice Japanese tea room during your trip.
Not sure if you were looking for Japanese tea rooms as in specifically Japanese tea ceremony, or just tea rooms in general serving Japanese tea in a more traditional feeling room. I've found that many of the Japanese tea companies (Chanoha, Ippodo, Sakurai Tea, etc.) have stores which also offer tastings and tea flights, and there are also some unique modern tea cafes, one of my favorites of which is Tokyo Saryo, which does hand drip tea. I have plenty more recommendations if you're interested!
I think it also has to do with retraining social expectations to know that people are expected to reuse bags at the grocery store or wherever. At the grocery stores here in Japan, they actually charge about 2 yen for using plastic bags, but the norm is to take plastic bags anyway, so it's more like they subtract 2 yen for not taking plastic bags. When buying takeout lunch, places will bag the lunchbox faster than you can open your mouth. There needs to be a way to disrupt the "plastic bag by default" mode of thinking.
In that case though, you would know that the "No" friends are definitely not dogs, and the "Yes" friends are possibly a dog, so it seems like the dogs would still not be completely anonymous. Wouldn't the dogs be better off not partaking in the survey and being narrowed down into a group of possible dogs?