Has anyone ever had their pet act difficult or strange when they were pregnant? I have an 18 year old cat and ever since I got pregnant she's been acting out refusing to use her litter box. I thought at first it was because she's getting really old and can't control herself. But I've seen her look me dead in the eyes and pee on the kitchen floor just because she can. Can animals sense these things and be aggravated because of it? My male cat is just as loving as always and seems the exact same.