We have 2 3.5 month old Bloodhound mixes that must have bladders the size of a pinhead. They are great about sleeping through the night (generally 7-8 hours) without having to go outside. However, in the evenings, they want to go out every 30 minutes, if not sooner. They don't drink excessive amounts of water, so I have no idea how they could have this much pee!! Is this fairly common? Is there a way to teach a dog to hold it longer without putting them in a crate that they don't want to mess up? They stay in a small room during the day while Hubby and I are both at work, so I don't want to coop them up any longer in the evenings. Any help or advice is greatly appreciated.