public double getTailLength() {
        if (breed.equals(TAX_SVANS) || breed.equals(DACHS_SVANS) || breed.equals(STOR_TAX) || breed.equals(STOR_DACHS) ) {
            length = 3.7;
        }
        else {
            length =  (double) age *  weight / 10.0;
        }
        return length;