Rental asking for letter with breed

I’ve had an ESA letter for my dog since last September (it was rewritten in January to add some cats as well). I’m currently trying to move and the new rental is asking for a letter that states what their breeds are. Is that something that’s ok to ask? My dog is a mixed breed and if I hadn’t gotten a DNA test done I wouldn’t even know what he is. He’s a pitbull, lab, German Shorthaired pointer, and Australian cattle dog mix. Can they deny my letter for not having breed stated, but everything else on it (color, weight, age, gender, how they help me, etc)?