Well hope he gets better soon,and you can also try some raw hamburger meat mixed with his kibble. We did this with Buddy when we were trying to put some weight on him when he would not eat. He will just get tired of his kibble until we change to one he likes. Picky little butt. As far as the lemon juice I would only use it when he has a lot of phlegm in his throat, like they do when they over heat.