Why is the animal curtly against dolphins?

It seems there may be a misunderstanding in your question, as animals do not express opinions or sentiments like humans do. If you are referring to specific animal behaviors towards dolphins, it could be due to competition for resources, territorial disputes, or predatory instincts in some species. Certain animals may see dolphins as rivals or threats in their environment, which can lead to aggressive encounters. However, interactions vary widely depending on the species and context.