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Exposure to radiation, or it is turning into a Zombie cat.
fuel filter
If the vet was unsure of what was wrong with your cat, then maybe the vet gave your cat the wrong kind of medication so it didn't cure your cat. If the veterinarian is unsure of what is wrong with the cat and medicated him anyway, he is obviously incompetant and you need to see a different veterinarian. The wrong type of medication could seriously harm your cat and to prescribe it anyway is irresponsible.
I don't have a cat either.
replace cat
Nothing is probably wrong, it's just that your cat seems to be very sociable.
Its only a cat. 3 days?
Not enough information. It may be you that is moody and the cat is reflecting it.
He is in love with his cat and his grandma!
2, one before the cat and one after the cat.
Nothing is wrong. Just a little overexcited dog. He's lucky your cat doesn't give him a good swat, with its claws out.
You should take the cat to the veterinarian for diagnosis and treatment.