Practical guidance
What this changes for the family routine.
Measure the dog you have today.
Use current weight and current body shape, not an old record. Senior dogs can gain or lose weight quickly, and posture can change after injury, surgery, or fatigue.
Photos explain what numbers cannot.
A side-standing photo and a natural resting photo show depth, posture, and confidence. These details help support understand whether the system fits the routine, not just the measurement sheet.
Do not ignore entry ability.
Some dogs step in calmly. Others need rear support, front support, or a slower introduction. Entry is a fit question because a stressful entry can ruin an otherwise correct size.