My 33 yr old mare didnt eat her dinner last night, nor her breakfast or dinner tonight. My hubby said she has a runny nose, so I checked her.. yup it is.. but its not yellow, or clear.. and it runs out of her nose, after she grinds her teeth together?? I gave her some penicillin, and a shot of banamin for pain.. Ive called 2 different vets, 3 times.. and no one is responding?? I think it might be a tooth?? she isnt stressing, no flaring nostrils... no fever..she has her blanket on and two heat lamps... what do yall think it might be?