I feed my 8 month old siblings a can of tuna everyday spread out into 2 or 3 times a day( total of 1 can per day) the ingredients are tuna, water and salt. Is thin bad?
Welcome to The Cat Site.
What else are you feeding your cats?
Tuna is not a good food for cats; it has too much sodium and possibly heavy metals depending on where the tuna was caught. Occasionally as a treat it is okay but definitely not every day.
May I suggest you feed them a piece of raw chicken instead.