Hi again, and thanks so much for your patience!
I assume his dosage was lowered, due to blood work that showed his blood sugar was lowering or getting too low or close to normal. I'm also assuming that He's getting a divided dose--1.5 units every 12 hours.
Yellow stools can indicate various conditions: a problem with the liver, gallbladder or pancreas. It can also mean it's moving through the digestive system too quickly or there is a bacterial imbalance in the bowel.
The food he's being fed is recommended for urinary problems to balance the pH of the urine. If he's peeing outside the box, I'm assuming he had a problem with urinary tract infections or a blockage in the past?
As a diabetic, he should be on a high quality canned food that is high in protein and low in carbs. Various companies make special diabetic foods, but I've had success with grain-free Wellness CORE and EVO (also grain-free) either canned or dry, because they're good for diabetes and they also have a good urinary pH.
If he's laying only on the tile or wooden floors, he may be warm from a fever and these surfaces are cooler.
It would be advisable to discuss the food choices (do not let him talk you into Science Diet DM ) as, the ingredients in Science Diet foods are not superior and they do include fillers and artificial colors, flavors and preservatives. Also, discuss the yellow stools and he can run some specialized tests on the liver, gallbladder and pancreas, in addition to the routine blood panel, to find the cause and treat it. Also, a fecal sample should be analyzed to find more information. He could have an allergy to and ingredient or ingredients in his current food, which also doesn't contain the highest quality components.
Feel his whole body and see if he feels much warmer than usual. Ears and noses are not true indicators of fever, if they feel hot. If you can take his temperature with a regular lubricated rectal thermometer or a digital one, normal for cats is between 100.5 and 102.5.
These are symptoms of hypoglycemia you can watch for, if his sugar gets too low:
If you are not testing his blood sugar at home and you see any of those symptoms, get him to an ER vet, immediately, and start rubbing honey, karo syrup or pancake syrup into his gums right away and on your way to the ER.
I hope all will be well with your Samson!
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