“Too Cute!” began as two specials in 2011 before turning into an hourlong series in 2012. Each week, the series follows the lives of either kitten or puppy litters — with baby animals from ...

For fans who are looking for even more cute once the marathon is over, Animal Planet will be airing a Too Cute! mini-marathon on Sunday, March 23 from 6 a.m.-8 p.m. ET/PT.