[Susan]

Hi Lisa, it may be the kibble your dog just doesn’t do well eating a hard processed kibbles some dogs don’t do well eating all kibbles….
Your dog could be suffering from Environment allergies more then food sensitivities, with food sensitives your dog will have sloppy poos, even diarrhea, vomiting, rumbling, gurgling bowel noises, jelly poos, looks like poo & jelly, red paws, itchy smelly ears, red around his mouth from food, anal gland problems rubbing bum on carpet & grass…
Have you tried cooking his meals elimination diet or tried premade raw diets instead of kibble?
Your best to see a Dermatologist so they can work out what your dog is allergic too, is it dust mites, is he allergic to things inside the house or grasses, trees, plants pollens, is it food related ?

Have you tried “California Natural” Lamb Meal & Rice it has just 3 ingredients, no peas, no fish oil, just Lamb Meal , Rice & Sunflower oil, a lot of vet use “California Natural” kibbles
or cook or feed pre made raw diet for has dinner & give the California Natural for breakfast…
When they have allergies the only thing you can really do is bath weekly or the days they’re real itchy bath to wash off the pollens & allergens on their skin, find a food that agrees with them & work out what is causing their allergies..