Sentence:  The old wives tale is that a dog that <WSD>scoots</WSD> on its rear has worms, but that's rarely the case. Dogs that <WSD>scoot</WSD>, lick, or chew underneath their tails usually have anal gland issues. 
Meaning of the word marked with <WSD> tags:  To move with the forelegs while sitting, so that the floor rubs against its rear end.