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.
Because this breed is so small, when a female is going to be paired with a male, the female should weigh more than the male. This is a key component in aiding the dam to carry well and deliver with the least possibility of complications. The male should be under 4 pounds (1.81 kg) or 4 pounds maximum.The male's parents should be between 4 and 5 pounds (1.81 kg to 2.26 kg). Doing this, will give the female Yorkie a better chance of being able to have her puppies naturally.When these guidelines are not followed, there is a greater chance that the female will need to have a cesarean section.n the flip side, after the age of 5, with 7 being the absolute limit, the female needs to rest. If a person is only planning 1 litter and does so when the dam is 4-5 years old, another litter can be carried safely at age 7.