A baramin is a creationist "created kind", all organisms that are descended from some specially-created ancestor.

The word was coined from Hebrew bara ("created", like in Genesis 1:1) and min ("kind", "species").

But that word is bad grammar in Hebrew. Proper Hebrew would be "min baru" with plural "minim baru'im"

I think that "baramin" is a VERY naive translation from English. It uses English word order, adjective-noun, instead of Hebrew word order, noun-adjective, and it uses a past-tense form instead of a passive participle, while in English, most verbs have identical-looking simple past tenses and past/passive participles. The "created" in "created kind" is a passive participle, an adjective derived from a verb with passive-voice meaning.

That aside, creationists have differing opinions on what is in a baramin. Do Creationists Really Believe in Evolution? | The Institute for Creation Research proposes a common view among young-earth creationists, that a baramin often includes several species, species that share two or fourteen individual ancestors that Noah had carried aboard his ark. Thus, in their account, the dog baramin includes domestic dogs, wolves, coyotes and the like, species that all diverged after Noah's Flood. This requires descent with modification, what we more usually call evolution.
What then are we to make of the recent comment by Dr. Hugh Ross, well-known semi-creationist, and aggressive advocate of billions of years, the Big Bang, and death before sin, who labels ICR and other young-earth creationists as "hyperevolutionists." He claims that we must account for the "half billion species" in the fossil record by major changes after creation and the curse, and the "five million" alive today in the thousands of years since the Flood from the "30,000" or so on the Ark. (The Genesis Debate, 2001, pp. 126_127.)
Hugh Ross evidently believes that a baramin is a single species.