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I just find mineral oil to be messy and laxatone can be given several times a day.
Cats with a manx tail can have rectal issues with neurological things, but usually if the cat had a tail and was removed for medical purposes...their neuro development should be fine.
There are components like canned pumpkin (libbys pie w/o the spices and things added) can be given 1-2 tsps and that helps with constipation.
I would talk to your vet as well about adding fiber/metamucil/or medications to help with motility to your cats diet.