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My name is***** and I would like to assist with your concern. Do you have a photo of the what this looks like?
The most common cause of the brownish discharge is an increase in normal eye secretions and drooling. The reason we see the color is because normally the saliva and tears have a pigment to them, but we do not see this because it is swallowed or drains out of the tear ducts from the eyes to the nose. When we have over production of saliva and tears, they spill over -- so for the eye we see it at the inner corners running down the side of the nose and from the mouth we see this around the lips/muzzle. The pigment is normal. The fact that there is more is what needs to be looked at more closely.
Cushing's disease is something I am very familiar with. In addition to weight loss, we also see a few characteristic signs which are: increased drinking, increased urination, increased appetite (although in advanced stages the appetite can decrease as well), changes in skin (color, flakey, dry, hairloss) and a pot-belly appearance. Does your dog have any of these signs as well?
Unfortunately I cannot give a specific diagnosis without an exam. This site is for information purposes. Without any of the other signs, Cushing's disease is unlikely. If you are able to attach a photo of what you are seeing, that would be helpful.
Yes, I am sorry for the confusion. As a diagnosis of the discharge from his mouth and eyes, it is difficult to diagnose without a physical exam. Thank you for submitting the photos though. That helps tremendously. Based on these photos, what I discussed earlier does hold to be true. This discharge is the normal saliva and tear staining with the pigment "porphyrin" being more noticeable.
The difficult part is trying to figure out why there is more secretions than normal. I can see in the photo there is also lick staining present on the feet. This is that same pigment from saliva - porphyrin
This is not an uncommon occurrence in bulldog but since there has been a change with him from not seeing this to suddenly seeing it -- that is the main concern. Was this going on while he had his previous illness of not defecating? Being nauseous will cause excess salivation and would lead to more of the discharge being noticed.
An infection in the mouth can increase saliva production, yes. The discharge itself would not be from the infected tooth or gums though. Infected teeth are often painful so we would typically see a change in appetite or the ability to chew normal on one side of the mouth. Once tartar has hardened on the teeth and formed calculus, brushing will no longer help. The calculus needs to be scaled off while the pet is under anesthesia. The most common teeth to break or get infected are the larger chewing teeth on the top and bottom, towards the back.
For example, if the teeth look like this, then it is not infected but would benefit from having a dental cleaning done
However, this tooth is infected and would need to be removed.