Hi Carol and welcome to YorkieTalk! We try to share everything we know, either from research, learned from our vet or from experience. Our vet recommended Honeycomb cereal for Toto as treats [I'm not at all certain if that one is better because of content or if it was her personal preference] but since we never stray from her advice ... Toto gets Honeycomb!
The only things that we add to her diet without consulting Dr. Lucy is treats that are dog specific or if we change any of her food we also discuss that with her. She is a great vet and we have her on speed dial at her office and at her home!
The thing about jumping off things ... I believe that injury to the little joints gets worse as they age. We don't allow Toto to get off the sofa or the bed without something like a little ramp or cushions to give her a soft landing! In addition to some of the drawbacks of owning a Yorkie such as hypoglycemia, trachael collapse, etc., is their little joints! We also don't let children hold her. They may play with her on the floor all they want but we just don't let them pick her up! Our theory is "better safe than sorry"!
Hope that helps! Good luck!