Do you always wear the same pair of shoes when outside? My little house rooster HATES a certain shoe that I wear. He's fine with every type of shoe/slipper/sandal I have, but will not tolerate my 'every day shoe' which is a just a brown leather sneaker.
So in all seriousness...Maybe Bruce has eyes for Crocs? If it's not the shoes, can you slip him a stuffed dog toy? My little house rooster likes to mate with my dog's feet and this one specific stuffed toy of hers - a brown moose. When he goes for her feet, I've been shooing him off and pointing him to the moose. He does his thing and all is calm for 10 minutes. He's getting better about leaving the poor dog alone.
So in all seriousness...Maybe Bruce has eyes for Crocs? If it's not the shoes, can you slip him a stuffed dog toy? My little house rooster likes to mate with my dog's feet and this one specific stuffed toy of hers - a brown moose. When he goes for her feet, I've been shooing him off and pointing him to the moose. He does his thing and all is calm for 10 minutes. He's getting better about leaving the poor dog alone.