We have a 5 month old female golden retriever. Since we got her at 8 weeks, she's consistently needed to be let out to pee every 20 minutes while we're home. (she's trained with bells so she lets us know when she needs to go). If we push her to hold it for longer, she will pee inside the house without fail. However, she is able to be inside her crate when we're away for 4 hours without any accidents. Any advice? We've taken her to the vet where they ran several tests to see if there was an underlying condition and she got a clean bill of health. Anyone have any ideas how to fix this?