Yes, it seems like the poet is fond of cats as he seems to praise him by showing that he is bafflement of Scotland Yard. He calls Macavity a 'fiend' and a 'monster' because he might have wanted to portray an evil side. But at the same time he praises all his techniques He might have used a cat in order to create a negative character who is a criminal and escapes easily from police. The quick movements of a cat and its mysterious eyes might have influenced him to create this evil character in the form of a cat.
