They have a specialized digestive system which is much shorter than ours and much higher level of acidity. (fourmuddypaws.com)
Dogs that have a buildup of toxins in the blood or high levels of acidity due to kidney disease can also experience seizures. (pedigree.com)
UPDATE 5/17/15 — ACIDITY: After 5 months of being only on Humira 1X / mo, HCL tablets (scroll to item # 3 after clicking link), and water kefir, I noticed higher levels of acidity in my esophagus, some heartburn (especially if I don't take enough HCL from my other meals), and more burping due to carbonation. (100percenthealth.us)