my boy, Duke, has recently been switched to "Taste of the Wild" within the past two months, originally starting with the roasted fowl. about a week ago i switched him to the salmon flavor. last evening, i noticed that his back has sprung a long patch (ranging from near tail to upper neck/shoulders) of hard bumps. it is literally twenty some odd bumps and they move in a linear fashion no further than 6 inches from his spine (which i'm only using as a reference point.) the skin is flaking dramatically. i would be convinced it's the food, but i've had him on fish oil for nearly a year of his 16 month existence and the duck formula was so good to him. i'm having a complete meltdown. any help you can give would be greatly appreciated. i trust my vet with about any other breed, but he seems lost when it comes to Duke. p.s. would his skin problems cause him to be more aggressive. we have two kids and i notice that he gets more irritable when he has issues with his skin or if his anal gland gets impacted. not to be gross, just asking. thank you.