What is the origin of the idiom "help a lame dog over a stile" and when to use it?

The origin of the idiom "help a lame dog over a stile" likely draws on the image of a lame or injured dog needing assistance to cross a stile, which is a low barrier or step-like structure used to facilitate passage over fences or walls in rural areas. The phrase embodies the idea of providing aid and support to those who are physically or emotionally challenged, even when the task or favor may seem simple or insignificant. It conveys the importance of showing compassion and lending a helping hand to those in need, regardless of the perceived difficulty or impact of the assistance. It is typically used in informal conversations and is often used to emphasize the importance of offering assistance or support to those who are in need, regardless of the perceived scale or significance of the task.