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.
Some people tell me if they're too small, they're always sick and don't live more than 10 years or so. I find that hard to believe. My grandmother's dog is 14 and she weighs in at about 5lbs. Trinket is a yorkie/jack russell, weighs about 7lbs and is a frisky thing. Would a yorkie be a good match or should I look for something else? People down the road have 2 yorkies and they're timid little things - I find that so unattractive.