Additives used in the production of vaccines may include. 1  suspending fluid (e.g. sterile water, saline, or fluids containing protein); 2  preservatives and stabilizers to help the vaccine remain unchanged (e.g. albumin, phenols, and glycine); and. 3  adjuvants or enhancers to help the vaccine to be more effective.
The other element is a standard Yorkie that falls under or over the expected weight and/or size range. Breed standards have changed. The AKC used to list a minimum weight of 4 pounds (1.81 kg). Now, there is only a maximum weight of 7 pounds (3.17 kg) for a full grown, adult Yorkie. Even with this change on paper, most Yorkshire Terriers fit into the 3 to 7 lb. (1.36 kg to 3.17 kg) range. A dog smaller than this, fully grown, would be considered too small and may have size related health issues.
One interesting element to note is that the Shih Tzu, in general and per breed standards, is not that much taller than the Yorkie to its left. However, the dog is comparatively much bigger in regard to weight...9-16 pounds compared to 4-7.This is because of the body shape and construction. The Yorkie has a long, straight back. The Shih Tzu is more compact....he has shorter legs and while a shorter back, making for a more compact, almost square dog.ut then at the age of 4 to 5 months, the dog may grow quite a bit. Therefore, unless your Tzu is having eating issues such as refusing to eat, most owners should not be concerned about growth during this time. It is an up and down time...and it is most difficult to know what the ending adult size will be.