There can be many possibilities. It is important to analyze in what context this happened. Was it around toys, food, bones, or a sleeping area? Was one dog resource guarding you? Was it through a doorway or a small space? Did one dog insist on playing while the other wasn't willing? Most of all, was it just a noisy squabble that ended there and nobody got injured? Many dogs living together have small "discussions" which are just part of communication, but you need to keep an eye on these interactions in case they escalate to something more. If both dogs were engaged and there seemed to be a real intent to harm each other, in such a case, it would be best to have a professional evaluate the situation.