Same issue for me. I've finished the puppy suit quest line & the gazebo questline, had to quit to take care of other things, started up the game again & found I had to redo both quests again. That's why I was asking if there's going to be a save system at some point.
Viewing post in Mousetrap - WISHLIST ON STEAM! comments
ahhh, ok, so the issue is you're in the correct area, but wrong puppy suit. The puppy suit for the quest is on a crate & dog-shaped mannequin across from the ball gag in the basement. Pick it up & return to Talle with it to proceed to the next part of the quest. This part has arrows that you can follow to find her. The hardest part is the blindfold part at the end.