Ken, you say your dream makes no sense whatever - but I don't bet, and I never dream about betting. So your dream doesmake some sense. Why frogs I don't know, and yet they're clearly standing in for horses.
There was someone on AB yonks ago who occasionally explained other ABers' dreams for them and they generally thought he/she was onto something, telling them things about themselves they hadn't realised. There are some interpretations that seem to work for most people - eg a house frequently symbolises your body.