exactly, was this a dream, skrying, meditation, or just general curiosity? there's many ways to interpret symbols, it's best if you do it yourself because it's personal to you.
a black dog for example has been associated with witches along with any black animal. at the same time a black dog is believed to bring or warn of death. or maybe you like black Labradors or the colour in general. it really depends. red eyes can also have several meanings, evil and dangers, love and passion, or a turn of phrase 'red eye' is not only the name of a late night flight, but also a drink [among other things] you could see it as a combination of two things you like if you have a black dog and often take trips at night.
regarding a dream interpretation however a black dog symbolises the darker intents of someone close to you. the horse on the other hand, again, has several meanings, so depending on the colour and your interaction it's easier to determine it's meaning. horses can denote freedom, mystery, knowledge, attachment, and a slew of other things depending on a wide range of scenarios. same with the smoke, it could be trouble, or it symbolise agreement. the colour itself can play a factor in the interpretation.