Cat flu can make a kitten extremely poorly and even lead to death. Speak to your vet about getting your kitten vaccinated against cat flu.
Distemper is a disease caused by a virus. The virus spreads easily between dogs. It causes a wide range of symptoms including a cough, runny eyes and nose, diarrhoea, high temperature, thickened pads, tremors and fits.
Just like people, it is possible for a dog to have an allergic reaction to something such as a bee sting, a medication, or a vaccine.