Dog Pooping Inside and Not Obeying Commands?

I have a four year old mixed terrier. She is a loving dog and has so much love to give, but when she doesn't get her own way she does the toilet on the floor. Sometimes she tries to hide it other times she doesn't. This doesn't happen often, but is starting to become more and more of an everyday thing.

She has moved houses a few times in the last few years, but it's gotten worse since we got to our new house. The previous owner did not have a dog, cat, or another pet in the house and we have washed the floors countless times just in case its to do with a scent she doesn't like.

She gets walked three times a day, once in the morning, once when we arrive home after our working day and finally just before we go to bed and successfully does the toilet.

Recently she has became a wee jealous soul always wanting to be up on the couch or up on the bed and doesn't take a telling when we tell her to get down. She also doesn't like being left alone and starts barking and howling then does the toilet all over the floor and it seems she like shes doing it on purpose.

So recently we got a wee kitten and things have just gone from bad to worse. The dog doesn't listen to anything and ignores us and turns hear back on us and pretends to not hear us. She keeps us up all night jumping up and down on the bed and still does the toilet all over the place.

I really don't know what to do. We give both of them the same amount of attention and love, but nothing is getting any better.

By Kris