Interesting story, but though I would love it to be true, I kind of think that it is not a true story.
Because Jesus is sacramently present in the Eucharist. It would still look, feel, taste and smell like bread. Unless the dog had a supernatural sense of smell or something.
And if it were true, It would have been all over the Catholic news when it happened, and it wasn’t.
Well I’ll tell you a true story about a spirit.

My sis and her hubby were walking an old disused railway line beside our town 20 years ago approx.
The line was gone and it had been made into a walkway,.
There is a local story of a 15 year old boy being killed on that line way back in the 40’s when the line was in full operation.
A Baptist Church isn’t far from the spot of where many people said they saw the red light.
Anyway I’ll cut to the quick here, they had their black Labrador dog called Sam with them.
The dog came to that spot, and refused to go past it, my sis said she saw the red light and she was terrified.
When she got home her face was as white as snow with fright, her husband as far as I can remember didn’t see anything, they had to take another route home.
I remember someone I knew well, (deceased) an atheist.
He told me distinctly that he didn’t believe in anything, but while passing that spot one night he said the shivers ran down his spine, he said to me, "I don’t believe in anything, but I do believe there is something there at that spot ".
So yes I believe animals can sense things us humans can’t.
wow, that’s an interesting story Eire! Thanks for sharing that! Could this be true?
I don’t doubt Transubstantiation, but the Priest on the site as you can see, is looking for more info.