Sudden (acute) colitis. If your dog suddenly develops colitis, it is probably induced by stress, such as boarding, moving, severe weather or some other change in lifestyle, or it could be from a dietary indiscretion, such as emptying the garbage can, too many treats or a sudden change in diet.
âVitamin D is needed for the production of brain chemicals such as dopamine and norepinephrine and acetylcholine. These brain chemicals are known to improve and increase attention span, and its concentration in the brain is directly correlated with the ability to focus for sustained periods of time.â.
There are three main neurotransmitters, or brain chemicals, that have been studied in BPD. 1  Opiates are released (under ordinary circumstances) by the brain to dull pain in response to body-tissue damage.  Serotonin plays an important role in the regulation of mood, sleep, and learning.