Ive noticed that my old was sneezing and at first didn't notice that her right nostrail was pluggrd with dried junk. And her right eye i.e. very red and drooping. Ive tried cleaning her nose but its not helping... Ive also noticed her left side of her jaw is a tad bit swollen. She still eating and drinking plenty of water.. She is ak inside dog about had her 10 years. Any ideas on what is causing this to my best friend?? Please help... Thanks amanda

Now that you have noticed something wrong with your pet; this would not have occurred over night. It can't be too pleasant for her. A vet visit is in order as we can't diagnose anything over the internet.

Agreed, a trip to the vet is best.
At her age it could be that her dental health is poor and this is a result of an infected molar.
It could be that she has injured the eye and jaw somehow.
It could be something entirely different, only a vet can tell you for sure.