Generally speaking, if a man uses "skinny dog" to describe a woman, it is difficult to interpret it as liking her. This statement is more likely to be an impolite or disrespectful expression, which may imply that he has feelings for the woman. There is some dissatisfaction or dislike in behavior or character.

Of course, the specific meaning needs to be understood based on the specific situation and relationship. Sometimes people may use inappropriate words to express their emotions, but this does not necessarily represent their true intentions.