Dogfarts !

It's one of my favorite stories from years ago, written by Brit Veterinarian James Herriot-
An "Upper class" lady called him to put her Boxer to sleep. She had tried everything possible to remedy the problem, but the dog continued to pass gas and embarrass her at her Tea Parties.
The dog was a beautiful, purebred animal, and Herriot asked her if she'd give him time to find a solution to her problem.

After leaving her home he visited an elderly client who was a Veteran of "The Great War". The old Vet owned a really old Irish Setter, eaten up by Cancer. Herriot euthanized the old dog, knowing the impact the dog's death would have on the old man.
And then it struck him-
"Would you consider adopting a pureblooded Boxer, free of charge?"
And the old man agreed to take the dog on a trial basis.
The dog was placed in his new home with hope the change would be good for both man and beast.

Two weeks passed and Herriot decided to pay the old WWI Vet a visit to see how the relationship was faring.
"How's the Boxer doing?"
"Oh Dr. Herriot, he's wonderful! Such great company. I don't know how to thank you!"

And at this point Herriot revealed why the adoption happened in the first place, which elicits wild laughter from the old man...
"You see Doctor, in the war I was involved in a tremendous battle. My eardrums suffered damage as you know because you have to shout at me to be heard. But what you don't know is that I also experienced a "Mustard Gas" attack which permanently damaged my sense of smell.
I cannot hear OR smell this dog's flatulence!"

A PERFECT match.

Now I need your help.
We have adopted a "mostly Chihuahua". He's filling a void in our lives left by the death of our little Lucy.
He's a GOOD BOY, but...
He is gassier than me. The smell of his flatulence would peel paint off walls if he was in close proximity.
I've looked online for help and find nothing. Everything there just says insure he isn't eating trash or anything else he might pick up outside, or a change in his food is suggested.
But he's a really PICKY eater. He's older and his teeth are bad, so we have to feed him canned dog foot. And believe it or not, he turns his nose up at chicken.

I'm hoping one of you has a miracle cure.
I'm NOT deaf. And my sense of smell is still reasonably good.
He absolutely GAGS me about once an hour.

Is there a secret anti-gas fix we can apply?