Mine goes every other day - he's 7,5 months now.

I think it has a lot to do with what they eat, not only with the smell (got that same issue with tuna here too!) but also how often they go. If the food they get contains a lot of hard to digest ingredients (like vegetables or grains etc) there will be a larger amount coming out the other end so they will need to go more often than if they get only highly digestible food such as meat and organs.

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