ANSWER: The Prophet salla Allahu alaihi wa sallam prohibited us from breathing in a vessel. Blowing over food is not permissible as it contaminates it and makes it disliked to others eating after you. But if no one is going to share it with you, you can blow on it. 

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ANSWER: No problem in keeping these animals as pets, providing you take good care of them.  It is not permissible at all to buy & sell cats or dogs. You can buy the other mentioned things without a problem. 

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ANSWER: Yes, this is riba and one of the major sins in Islam because this profit is fixed.  For any investment to be halal, it must be a halal business and you must share both profit and loss and the profit must not be fixed (Percentage can be fixed but not the actual amount) 

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