re: Bad, Terrible, Awful Dog Breath

Probably a dental abscess

Your dog probably has a rotten tooth, go to the vet and cry about the money you're about to spend

Gonna happen when you lick your own bunghole long enough.

Mine is old, fat and has horrible breath. He eats shite and mushrooms in the backyard all the time.

He is almost 11 though and the vet isn't comfortable putting him under for a teeth cleaning, so he's just a stinky breath dog.

Probably a rotten tooth or just needs a dental cleaning.
Take him to the vet.
Otherwise, I have found that the dental chew treats help a lot. Not cheap, but you can find the Kirtland brand for almost half the price at Costco.
Make sure he's getting enough water and watch what he's eating. If cats are shitting in your yard, he is probably snacking on it.

Brush their teeth, and give ‘em Bison/beef tendons to chew on. Greenies are a rip off, the tendons are way better and last longer so more economical.

It's a thing I see consistent with older dogs, and in my experience (anecdotal entirely) the legit teeth cleaning process has never affected the bad breath problem. I think it is in their gut, and I don't know a remedy. I've been around several dogs that had -uniquely- bad breath, and very powerful. Each one of them all had their respective owners get the real dental hygiene process for their dogs and man, you're talking almost 0% better.

Gotta learn to love'em through it.

LINK

Im sure he has a lot of plaque buildup.

I buy my dogs the brushing chews for treats. Milk Bone sells them. Its shaped like a bone an on both sides it has lumps in them so that when they are chewing it brushes against the back of their teeth.

Just like with humans, if you don't floss and even brush properly, food gets stuck and even if you have very small pieces of food.. Like any food you leave out for awhile it starts to smell horrible..

If your dog allows you to do so.. Use a toothbrush and make sure you get his back teeth where all of that shite builds up.

wtf