You would use grams (g) or kilo-grams (kg) depending on the size
Weight and/or height
The kilogramme.
Depends on what measurement standard you are using and what field you are referring to. It is easier tlo measure in kilograms because it involves smaller numbers. However, if you were studying astronomy, you would likely measure the dog in grams, or solar masses.
You can use the unit of "inches" or "centimeters" to measure a dog's tail length. Using a measuring tape, start from the base of the tail and measure to the tip for an accurate measurement.
The mass of the dog will be 56kg.
measurement of Feet
Depending on the type of harness, you will need either just the dog's girth measurement (measure behind the front legs around the dog's belly) or if you are wanting a traditional fixed harness that slips over the dog's neck, you will need the circumference measurement of the dog's neck too. Most harnesses these days are the step-in type and the straps sit on the dog's shoulders rather than the neck so just measure the girth only. You can see a diagram on the reference link below. I am now adding a full 'How to measure for a dog harness guide' below.
Put the dog onto a scale. If it won't stay on the scale, then try weighing yourself first, then weighing yourself while holding the dog, then take the difference in weight.
The mass of the dog can be calculated by setting up an equation. If we let x be the mass of the dog, then the equation would be x = 10 + 0.5x. Solving this equation, we find that the mass of the dog is 20 kilograms.
If the dog does not stand on the scale, the scale will only measure the mass of whatever is placed on it besides the dog. So whatever object is placed on the scale will be the mass that is measured, not the mass of the dog.
You would measure a dog's weight in pounds--if that is your question.
Mass is typically used to measure how heavy an object is, including animals like dogs. Volume, weight, length, and density are not direct measures of weight or heaviness in this context.