Which method is described as unique involving teeth on lambs?

The method that involves unique features related to teeth in lambs typically refers to castration. In the agricultural context, particularly with lambs, the process of castration can be significant and is often accompanied by an assessment of the lamb's teeth to determine its age and ideal timing for the procedure.

Castration is performed to prevent breeding and also to manage behavior in young male animals. The examination of teeth helps farmers and veterinarians to carry out the procedure at an appropriate age, which is essential for the health and welfare of the animal. This practice highlights the importance of understanding animal development, making it particularly relevant in discussions surrounding animal husbandry.

The other options are unrelated to teeth or the specific practices associated with lambs. Neutering and spaying generally refer to sterilization procedures used in cats and dogs, while declawing is a procedure that removes the claws of cats and does not involve teeth or sheep at all. Thus, the unique connection between teeth and the specific method of managing lambs' health makes castration the correct answer.