<human>: Can you give me a shortened version of the text?

I've had this little Dachshund since he was a pup, but that was 15 years ago and things are starting to change. My little bro is starting to have some problems. He's had dental/oral issues since he was a puppy (terrible breath, teeth pulled, gum disease, etc). I've tried everything with the little guy but nothing is working.

I've gotten him some soft mush food that he can eat and I give him ground up chicken (after bone removal) so he's still eating plenty. My main concern is that he whimpers and cries when he drinks. I'm sure it's because of the sensitivity and the water causes him pain, but I worry that he is not drinking enough. I can't get anywhere near his mouth with a brush or ointment because he either yelps his brains out or locks his jaws shut. I know the end is near, but I want to try and make his remaining time as comfortable as possible.
<bot>: My 15 yr old Dachshund yelps whike he drinks because of terrible oral issues. Any suggestions? Tips? Help?