https://images-wixmp-ed30a86b8c4ca88777 ... reEDeXpcwc
( Author's Note) (Reupload - this is an old pic from 2014)
Yeah, I went there and drew some Breen. I am a Trekkie, I had to, eventually!
Remember the Star Trek DS9 Episode Indiscretion? In that, Major Kira and Gul Dukat masquerade as Breen guards to infiltrate a mine. I always thought that they HAVE to know what the Breen look like under those refrigerator suits, since they probably knocked out two Breen guards to take their uniforms... Here is how it probably happened. Luckily for Kira and Dukat, they just happened to find a male and female Breen guard who had uniforms just their size.
And yes, much like Ezri Dax, I too think the Breen must probably be furry. The snouts on their helmets, the (probable) fact that their homeworld is extremely cold - I like to imagine they are wolf-like anthros.