Do you beleive that animals are sensitive to a person being pregnant?

Personally I believe they are, my moms dog used to just treat me like one of the family, since i have been pregnant though it seems that he likes me a lot more than he likes anyone else. It is actually getting a little annoying that he is always trying to sit on my not so available lap and he is always jumping all over me. I really think that he senses it or something. Its just really weird. I've also noticed my boyfriends dog is avoiding me more ha ha she used to love me but now she just acts like i don't exhist and walks past me. So strange.