Yes they are originally made for dogs but what can we say? When something works it works! The best part is that they come in a pack of 4 so you can swap them out several times a day if needed to keep your birds foot sanitary. We have also put a drop or two of Tea Tree and Lavender oil in the bottom of the boot so it's actually healing while the bird is walking around. They are water resistant and have a pull tight bungee that can be adjusted down to fit your birds leg comfortably. They have a soft inner layer so you don't need to worry about rubbing.
If you are purchasing for a bird with heavy feathering it's best to go 2 or even 3 sizes bigger and tighten them up as needed.