My guess is that in real life usage, the word tends to mean "mammal". But since I don't live in Japan, nor have any Japanese friends to ask about it, I have to go by the dictionary.Original: 小動物
Kana: しょうどうぶつ
Romaji: shoudoubutsu
Definitions:
小動物 (しょうどうぶつ) = small animal/