Thank you everyone! I think the key to their successful blending is that Andy came to us at 8 weeks of age and only weighed one pound. Trevor was not threatened in the slightest. I have noticed though that Andy is always the one to nestle next to Trevor rather than vice versa and is always the one to begin grooming him. Trev always reciprocates and they do have some intense grooming sessions but Andy always starts them! In a way I think Andy looks at Trevor as his Dad.