How much childrens benadryl should you give a less than 5 pound chihuahua?

I use an eyedropper and give mine only a couple of drops. I have to give mine Benedryl when she gets her vaccinations.

Additional Answer:

Dogs can have 1-2mg of Benadryl per pound, every 8 hours. This can be used to treat allergic reactions, and it also has some anti-anxiety effects. As a general rule, Benadryl is very effective for both dogs and cats, as it is for humans, and, as with humans, the primary side effect is drowsiness, with dogs and cats, as well.