I bought vaccines for my pup and Im not sure how to do this. Im thinking i should give them to her cold since they have to be refrigerated and just pull the skin up on the back of her neck to inject it but how far does the needle need to go to be eff...

I have a min pin I rescued and thought she was unable to get pregnant because my chihuahua and her have been together many times. Now she is exspecting the end of this...