Oh yes, I have seen a dog attempt to have it with another male dog, but I've also seen a dog try to make it with anyone's shoe. The homosexuality phenomenon we see in nature is a result of instinct and a horny animal. However, we don't see the females doing this. So, if we look for homosexuality (as far as relationships), there is none such behavior in nature. You will not see two male or female foxes rearing a den, or any other homosexualt relationship. But there are heterosexual relationships. So, on one hand we have at least one instance of heterosexuality in nature and the other hand we have no instances of homosexuality (relationships not sex) in nature. Which case is the more likely to be true concerning nature. Even if there was a handful of cases of homosexuality (relationships not sex), there is a vast number of cases of heterosexuality.