well seeing as i have FOUR dogs that i just adore and take almost EVERYWHERE with me when ever possible.... i can understand them wanting to bring the dogs..HOWEVER it is only one day..shouldn't be a big deal. I also know how does/doesn't like or welcome dogs. My dogs are perfectly happy to sit in my car even for HOURS! When i do leave my dogs at home they are all adults and can hold it for a very long time... i think a adult dog can reasonably hold it for 6-8 hours (or should be able to). If i'm going to be gone for much longer than that i put them in my barn which has a very large outdoor pen and some barrels with hay in them so they can cuddle up if it's cold. Now these ARE house dogs (aussies) but they seem to do fine outside all day if i'm gone. I think the "no heat" is an excuse your brother is just making up... there are other possibilities like someone else mentioned a heated bed or something.