What a great looking guy! Don't forget to transition him gradually to the Honest Kitchen over at least a week- 3/4: 1/4, 1/2: 1/2 then 1/4 :3/4 of the old one:new one. You can expect him to have bigger bowel movements and see vegetables in the poo with the Honest Kitchen, so don't worry about this.
If you want to make him really healthy add to his food once daily :
1)turmeric ( start with 1/2 teaspoon and work up to about 1 teaspoon per day ) eg. Club House brand from Costco, with about 10 grinds of fresh pepper
2)coconut oil ( start with 1 teaspoonful and work up to about 2-3 teaspoons per day gradually)
3)a can of sardines packed in water once a week
4)possibly start a glucosamine supplement early to prevent arthritis eg. Vitaflex-4000 1/2 teaspoonful daily
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