Diva is a very hyper active dog and is potty trained in the house and this topic was always a concern to me as well. She has two litter boxes in the house and she'll twinkle like every hr. And we brought her to the vet b4 and the vet said it was very minor urinary tract infection, so we gave her meds 4 that, but she's always pee's quite often. and i found that the medicine didn't change anything. So I wonder if she holds it. For example....i dont take my dog out for walks but when i see other dogs out there, they will pee like 4 or 5 times. So to me i think diva holds her pee and lets it go whenever she pleases.