Canned tuna?
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I feed mine canned chicken daily, but I've never tried tuna.
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My Basenjis love tuna–they get it as a meal treat once a month or so. I have not noticed any problems. I feed my dogs other fish (left-over salmon and other white fish) as part of their diet along with oatmeal, rice, green beans, carrots, sweet potatoes, meats and chicken. They're very healthy 12 and 14 year olds.