The Adventures of Milo and Otis
子猫物語 (original)
Le avventure di un giovane gatto e di un cane che si ritrovano separati accidentalmente e ognuno si trascina in un pericoloso trekking.
Starring Dudley Moore, Kyoko Koizumi, Milo, Otis, Shigeru Tsuyuki
It's a kids and drama movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Italy.