One vet once suggested a onesie. Like a baby would wear with footie pajama type feet. Not sure where you'd get one, maybe one intended for a doll.

Also, I've got an inflatable collar I use now and then. It's less irratiating than an e-collar but does the trick. It's like an inner tube the dog wears around it's neck.

Are you treating her feet at all? My frenchies have allergies and when their allergies get bad they chew their feet a lot so we use EnteDerm www.drugs.com/vet/entederm-ointment.html ointment and put the cone heads on them when we do so they don't like it off. It's anti-inflammatory, antipruritic, antifungal and antibacterial so it soothes their itchy feet (and ears) while also treating them. After a day or two all is well and we don't have to use the conehead/ointment any more... until it comes back. Usually a change in weather or a prolonged fetch session on concrete causes their feet to get irritated.

We have one of these hard plastic collars for when our boy's allergies get really bad: trainingandcontrol.petedge.com/To...pro He's learned to lie down in bed with it on and it has snaps for 3 different sizes so it's easy to fit on him and there's no way he can get his foot near his mouth. I just found this kind of collar on the site: trainingandcontrol.petedge.com/Bi...pro and it looks like it wouldn't be as difficult to live with. Have you considered a muzzle? It sounds like you're looking at extreme solutions for your poor pup and normally I wouldn't suggest it, but it sounds like you've tried all you can. Since your dog is a flat nosed Shih Tzu maybe a basket muzzle would be better than one that would ordinarily wrap around a nose (with Frenchies I understand the plight of an owner of a flat faced pooch) apparelandaccessories.petedge.com/G...ro or if she's really small maybe a cat sized one apparelandaccessories.petedge.com/G...ro hopefully it wouldn't cover eyes like in this pic of the kitty.