You wouldn't be using the Oster that you linked to trim his body hair. It's useful for sanitary trims, paw pads & ear tipping. You can use the #10 on your Andis to do all that. You would use either the #7F or #4F blade of the Andis to trim his body.
To use a comb, there has to be some length of hair & it will not take off much unless the comb is a very small/ short one. |