I would assume it refer to fighting, as in 'they fought like cat and dog'. But I've never heard it used like this (UK).
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lamjinIn the this sentence, "My husband and I will get into cats and dogs."Well, if Investopedia is to be believed, that sentence might also mean that my husband and I are going to get involved in speculative stocks:
What's the meaning of " CATS AND DOGS" here?