这是Lion Books系列的第1部动画作品。该系列在制作时还尚未确定是否将在电视上播出，但制作团队仍然冒着相当大的风险先行制作了26集作品，然后再试图将其推销给电视台。他们将自己的热爱融入到工作中，不断追求着高质量，通过这部作品可以充分感受到手塚制作公司的热情和执着。原作是一部以入侵为主题的科幻杰作，其中引诱主人公走上邪路的绿猫实际上是企图征服地球的外星生物。

这是Lion Books系列的第1部动画作品。该系列在制作时还尚未确定是否将在电视上播出，但制作团队仍然冒着相当大的风险先行制作了26集作品，然后再试图将其推销给电视台。他们将自己的热爱融入到工作中，不断追求着高质量，通过这部作品可以充分感受到手塚制作公司的热情和执着。原作是一部以入侵为主题的科幻杰作，其中引诱主人公走上邪路的绿猫实际上是企图征服地球的外星生物。

老张开了家宠物医院，收留很多流浪狗。他卖了自家楼房，买了四合院养狗。老张和狗们彼此的生活旋即发生了巨大改变。老张等人从狗身上感受到些微的温暖。他正在走出困难和迷茫，重建生活信念……

老张开了家宠物医院，收留很多流浪狗。他卖了自家楼房，买了四合院养狗。老张和狗们彼此的生活旋即发生了巨大改变。老张等人从狗身上感受到些微的温暖。他正在走出困难和迷茫，重建生活信念……

傲娇的流浪猫娜娜（幸运小七）被悟（福士苍汰饰）救下后，在铲屎官悟的侍候下过着快乐的猫生。一人一猫度过了几年的温暖时光，主人悟却突然有一天要将娜娜送走给他人寄养，没等娜娜反应，便被悟带着踏上旅程。穿过北海道，跨越富士山，探访故友，悟的那些不为人知的过去也都一一展现。直到最后，娜娜得知了为何悟要将自己送走的真相，却依旧对悟不离不弃。

傲娇的流浪猫娜娜（幸运小七）被悟（福士苍汰饰）救下后，在铲屎官悟的侍候下过着快乐的猫生。一人一猫度过了几年的温暖时光，主人悟却突然有一天要将娜娜送走给他人寄养，没等娜娜反应，便被悟带着踏上旅程。穿过北海道，跨越富士山，探访故友，悟的那些不为人知的过去也都一一展现。直到最后，娜娜得知了为何悟要将自己送走的真相，却依旧对悟不离不弃。

Spiff and Hercules is the English translation of a French comic strip titled Pif et Hercule, featuring an anthropomorphic brown-yellow dog ("Pif") and a black-white cat ("Hercule") who, despite being best friends, are constantly fighting in a friendship/hate relationship. The character of Pif was created by José Cabrero Arnal for the French Communist Party newspaper L'Humanité on March 28, 1948, and the cat Hercules was introduced two years later. 　　The adventures of Pif also appeared in the British communist newspaper the Daily Worker (later The Morning Star) until the mid-1970s. 　　Spiff later got his own magazine ("Pif Gadget"), which was very popular as not only did it include several different comic strips, but offered a toy gadget in each issue. 　　Hercules also got his own version of Spiff's magazine, this one called "Super Hercule", but his magazine was more joke-oriented. 　　A series of 65 26-minute animated cartoons featuring the characters was produced in 1989 by Europe Images/M5 in France. Each program consisted of two episodes. United Kingdom television station Channel 4 aired the series in 1993.

Spiff and Hercules is the English translation of a French comic strip titled Pif et Hercule, featuring an anthropomorphic brown-yellow dog ("Pif") and a black-white cat ("Hercule") who, despite being best friends, are constantly fighting in a friendship/hate relationship. The character of Pif was created by José Cabrero Arnal for the French Communist Party newspaper L'Humanité on March 28, 1948, and the cat Hercules was introduced two years later. 　　The adventures of Pif also appeared in the British communist newspaper the Daily Worker (later The Morning Star) until the mid-1970s. 　　Spiff later got his own magazine ("Pif Gadget"), which was very popular as not only did it include several different comic strips, but offered a toy gadget in each issue. 　　Hercules also got his own version of Spiff's magazine, this one called "Super Hercule", but his magazine was more joke-oriented. 　　A series of 65 26-minute animated cartoons featuring the characters was produced in 1989 by Europe Images/M5 in France. Each program consisted of two episodes. United Kingdom television station Channel 4 aired the series in 1993.