Do you know for sure he is not allergic to Pork??? I know you said he likes pork, but if he is not allergic to pork there shouldn’t be an issue.
Keep in mind those patties come in 1/2 pound portions which is 1/2 a package of big country raw(they are 1 pound portions), so make sure your not over feeding it
Are you sure it’s not environmental allergies??
If he has been doing good with pork and you know he is not allergic to it then it would be fine to continue.
How long ago did you start him on pork from big country raw? Is the big country raw pork DINNER Or PURE pork??
If he is allergic to vegetables, this would be good if He is not allergic to pork.
You mentioned a couple days ago his fur is starting to fall out, if that was an allergic reaction, I would think it’s the dentastix or blue Buffalo treats since they are new.
For the heavy breathing, it’s getting warmer and you can expect to see him pant more because of the heat.
Is his breathing noisy??
Is he exercise intolerant, snoring, or loud breathing?? If yes to any of those then it could be elongated soft palate which is extremely common in Bulldogs.
How old is he??