How big is she? A small dog can really cause an injury to its delicate joints, muscles/tendons and sometimes fragile bones and/or repetitive stress to its joints from a lot of jumping and that is why most of us use a doggy ramp or doggie steps for our little ones. Tibbe is 5.3 lbs. and I make him use steps or a ramp and would if I lived in one room. Jilly dislocated a shoulder just using her doggie steps but she was just over 3 lbs. in weight and was almost 13 years old when it happened.
Also your dog could have discomfort or flat out pain from jumping so you might get some joint x-rays in case there is malformation of one or more joints, even spinal joints, etc., that the force of jumping might exacerbate. Maybe a vet check is in order with x-rays to see if she was born with a congenital problem or has an injury.
It could be fear and nothing more. Most Yorkies, however, are fairly reckless and would jump off very high things when they are highly motivated so unless your little one fell off something high or hurt herself during a jump, fear might not be the issue though it sure could be. Starting with treats and working with urging her with a high-value treat to jump off lower things and then working up to slightly higher things could work - though unless she is a pretty big Yorkie, I don't think I would ever coach her to jump off a couch, chair or bed.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |