Tour Scotland Leith Hall

Hello Sandy, I am a visual artist and I am working on an art project based on the history of Leith Hall in Scotland. I am wondering if you could help me. I would like to find out the name and the kind of a dog that belonged to the Colonel Alexander Sebastian Leith-Hay. Unfortunately the web reproductions of his ceremonial portrait with the dog are just not clear enough. I would very much appreciate your response. Sincerely, Maria Petschatnikov.

Can anyone help with this question ?