Brugs are hybrid dogs, which are a mix of two pure breeds. There are various types of hybrids some are 50% of both parents, but some are the result of breeding one pure bred and one hybrid. The process is detailed here. The dog can inherit qualities from both parents and not in equal proportions, so when picking a hybrid, check out the profiles of the two original breeds. For the brug, they are the Brussels griffon and the pug.
The Brussels griffon is an intelligent, friendly member of the toy group. The coat can be smooth or rough and red, black and red-brown, black and tan or black. The Brussels griffon is an excellent watch dog and fits well into apartment life, but needs to be walked regularly. The coat needs regular brushing and the dog needs to go to a groomer every three months. A Brussels griffon will weigh between 8 and 12 pounds. Brussels griffon are susceptible to a genetic condition called Syringomyelia a condition whereby fluid filled cavities develop within the spinal cord.
The pug is also a member of the toy group. The dogs have a nice disposition, are playful and come in fawn, silver fawn, apricot fawn or black. The pug does not need as much exercise as a Brussels griffon, does not need to be groomed as much and weighs between 14 and 18 pounds. Pugs are generally healthy, but tend to put on weight. They tend to have ear problems and their eyes and the wrinkles on the face need to be cleaned out regularly.
Pugs can have breathing problems, especially in heat and humidity. It can also be caused by a genetic problem that requires surgery. Cold weather can affect them also. This is one breed that needs a winter coat.
When you put the dogs together, the chances are you will get puppies that are lovable and smart, traits shared by both the Brussels griffon and the pug. The coats can be any one or a combination of the colors and the size will probably be somewhere in the middle of the two breed standards. Since they do not have the same generic problems, the pups have a reduced chance of exhibiting them. If the pup is the result of one of the pure breads and one of the brugs the chances of developing the traits of one of the pure breeds over another depends on the exact percentage of each one results in the puppies. It does sound a bit confusing, but if you do a bit of research and ask questions of the breeder, you should come away with a pretty clear picture of the new member of the family.