Oh come on. St. Francis did love animals. There is way too much evidence for that, He was not however a worshiper of "Mother Earth".
St. Francis loved animals as God's creatures and often used animals as examples - for example, the lamb was the example of innocence and humility, the birds cared not for possessions and sang God's praise, etc. There is a lovely statue of him at Santa Maria degli Angeli in Assisi, standing with a kneeling lamb at his his side. This refers to a story where someone gave him a lamb that followed him around and, when it came into church with him, knelt at the Elevation of the Host.
I think what people here are saying is that St. Francis wasn't the type who'd be out buying a rhinestone-studded raincoat for his dog or feeding his cat hand-chopped filet mignon. He loved animals, but in their place, as animals and God's creatures.