You know I see that all of you seem to have male cats, mine however is a female. She is fixed and I heard about a female looking for a mate but they don't do that if ther'e fixed I would think. and I just don't remember when this deep meow has started and she doesn't do it all the time. We just got 2 little dogs and there is a gate that separates them from my cat carlie but I just heard her doing that meow again. I think she is lonely and I feel sorry for her because of the change with the dogs, but it was unavoidable as the dogs has been in the family for a long time. I think she is trying to tell me to pay attention to her, I don't know.