I have dog with what appears to be swollen glands... under jaw is rather large and swollen.. any ideas as to what may be wrong? She is a 9 year old mixed lab.. my daughter says she noticed it a few days ago, and the dog doesn't seem to be barking at cars and guest like she usually does today. Any help would be great!

This needs to checked out by your vet ASAP. It is most likely lymph nodes, but you need to find out what is causing the swelling; could be infection (bacterial, fungal), but in an older dog, also have to consider something more serious.
Another possibility is a swollen salivary gland secondary to a plugged salivary duct.

Sadly we just got back from the vet, and my dog has lymphoma cancer. After much heart ache we choose to leave her at the emergency clinic to be watched and made comfortable until we can decide what to do, we were way too emotional to make a choose tonight... the most they can give her would be 2 months... this is pure he$$

I am so sorry about your dog. I was hoping it would be something simple.

My baby girl did pass away this December from Cancer. She is now running in doggie heaven. Thank you for answering