Fix your profile, your server isn't non-us/eu. Use proper capitalization when posting here. Use proper punctuation (emoticons are not punctuation). I'm going to guess you are trying to summon it when in SV, corehounds are exotic and only available when in BM.
please help. whenever i summon my corehound it keeps going away after. but whenever i summon my other pet it stays. please help me whey does my corehound keep going away thanks