I completely understand the bond you all talk about. I'm also very lucky for I have been blessed with several soul mate animals. It's completely devastating to lose them, but sometimes they get little comforting visits in dreams, sometimes they help send you another little soulmate animal just when you both need each other most, and you always learn important life lessons and are a better and more compassionate person for having your heart, soul and life touched by a special animal.
I don't believe there's any one and only soul mate animal for anyone, because animals are wise and generous and don't want others to suffer. When they can't be with us anymore, they're at the Rainbow Bridge or Heaven and want us to find comfort and love and continue to love and be loved by animals, not to replace but to learn more and have more joy and laughter and unconditional love.