Dog Training Questions

Mandy asks…OLD dog litter training, can i teach an old dog new tricks? o-0?got a very old dog in an apt housing, he's been at a house all his life and is used to going through a doggy door, im wanting to train him to use a litter box, any tips for helping this to happen? i have a cat too, should i give them seperate boxes? is it possible to train a dog that has to "walk it out" to use a confined area like that to go? can he learn to do it while being still? he's old and i love him but im

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