please explain me the meaning of this line and the meaning of ring throwing
{A triumph of surgery
footprints without feet}

Dear Student

Lumbago here refers to a medical condition of pain in the muscles and joints of the lower back. The ring-throwing is an activity that the dog had been actively participating in, with help from the gardener. But the health of the gardener now, did not allow the activity to continue.

Regards.​​​​​