Kumason, who is 6 1/2 years old, (born 11/2/2012), likes when I dremel his nails. He is very food motivated so putting cream cheese inside his bone works well. Not all dogs will do well with a dremel like Kumason. My 2 1/2 year old female, Himeko, does not like it even though I tried getting her used to it from when she was 9 weeks old. For her, I let the vet clip her nails which doesn't seem to bother her.