Male Cats vs Older Cats
My parents currently have six cats, three male and three female. The females are the eldest. The folks have had many, many cats and are deathly afraid of losing male cats to a urinary tract infection as quite a few have been lost that way. Their solution over the years is to feed all their cats cat food with urinary tract formula and, on the advice of a veterinarian, pour a little tomato juice on the food to stimulate a thirst so the cats will drink more water and help with digestion. As far as I know, it works.
The problem, as I see it, is the eldest female cats puke all the time, and not hairballs and the like, but visibly what they just ate out of the cat bowls. The folks' solution has been to cut down on the tomato juice. My solution/suggestion has been to mix two bags of urinary tract cat food with a bag of high quality adult/senior cat food so the females will stop throwing up all the time but this is met every time with a wall of resistance followed with horror stories about male cats dying in agony from a urinary infection. I'm stymied.
To me, the female cats aren't getting any nutrition at the expense of an overreaction. I could use some advice and other ideas and if I even have a legitimate concern as my experience with cats is limited.