Wow, this is a tough one. Maybe you could modify a fly mask from horse to dog, but that would take creative talent to try. Do you use any fly spray on her? I don't know if there are any kinds that would be ok for on a dog, but you could try or maybe wash if off after she's done with a good romp so she doesn't lick it. Do you have a screen tent she can use when she's just out to do her business?