My Fiance and I already have a 11 month old Peagle (Pekingnese and Beagle) Our Trainer at Petsmart told us if we were going to get another dog it would have to be a small dog and a Male. We personally dont care what sex it is but we are the type that if we fall in love with a dog we will want it. I am leaving for the Navy soon and our next dog is almost definitely going to a Goldendoodle or Labradoodle. Do we have to get a Male dog and does it have to be a small dog?? She said Female dogs fight the worst and she said that we would have to introduce each of them to each other after we are showing the new puppy lots of individual love like we did our first puppy. Is all this true??