Yeah, the tape is probably this stuff, but it only works if it’s out in the open, since it depends on the wind to work.
Also, it comes with this huge disclaimer:
In other words, if your pigeons are anything like my pigeons, this will work for about two days, and then they’ll be back.
It looks to me like you and Madame Le Chien are going to have to come to an understanding, that your balance du power may have to shift a bit. How badly do you not want the birds to eat the food vs. how badly does she want to eat outside…
Alternatively, you can personally stand there every feeding time and shoo them away.
If it was me, quite frankly, after having gone through the Pigeon Thing once already (it was with birdseed, we finally had to stop feeding birds anything other than thistle and sunflower, which our pigeons wouldn’t eat), I’d gently but firmly explain to Madame Le Chien that she was going to be dining indoors from now on rather than al fresco. You can do this, I would think, by simply bringing the Outside Dish inside, the way restaurants signal that the summer sidewalk dining season is over by removing all the white wrought iron tables and chairs. If the bowl isn’t out there, she won’t be looking for food in it, the same way it’s a rare restaurant customer who will stand out there on the empty sidewalk and wait for the cafe to bring him a white wrought iron table and a chair.
By all means, feel free to tinker, out in the shop, but I wouldn’t lay any money on a pigeon’s inability to figure out how to get food out of a dog feeder. It’ll have to have a door that pushes open, so Madame Le Chien can get it open, and I would think that any spring that you install that isn’t too stiff for her to be able to get the door open will still be flexible enough for a pigeon to get the door open just a crack and get some food out.
What kind of food is it, BTW? Kibble or canned? Big kibble or little kibble? Maybe switch to a bigger size of kibble?