Does raising pigeons at home affect Feng Shui?

Of course it does. If you have more than five on the balcony, you will be influenced by it.

If there are more than ten, it is a big killer. To put it bluntly, the degree of influence is related to the quantity.

If you are a bungalow, the place where pigeons are kept is far away from you and you don't have much contact at ordinary times, then the situation will be better.