We got a chihuahua puppy almost three weeks ago, she was 16 weeks old when we got her and the breeder assured us she was toilet trained 
She isn't toilet trained in the slightest, she's honestly not the brightest of pups (but she makes up for it in other ways, she's very sweet and affectionate). She has had numerous accidents daily since we got her and DP has been off work and watching her constantly and taking her outside when she sniffs the ground but you can't be there 24/7 and she just goes wherever she is standing. On the carpet in a million different places, on our bed twice, in her own bed twice (overnight with a puppy pad a foot away).
I don't think she's incontinent as she will sometimes go outside, and when she does we praise her and give her a treat. But also at times she will go outside then come straight back in and pee on the floor within minutes in another room.
I really don't know what to do. Our other chihuahua was absolutely fine and we had very few accidents. I wouldn't mind if the accidents were getting less frequent but she just doesn't seem to understand that you can't pee anywhere!
Please help me oh wise Mumsnetters before I have a nervous breakdown and have to have all my carpets replaced 