An Etymological Dictionary of the German Language/Rüde
Rüde, m., ‘hound,’ from MidHG. rüde, m., ‘big hound,’ OHG. rudo, hrudeo; OHG. *rutto (comp. ModHG. dial. Rütte) is by chance not recorded, but it may be assumed from the equiv. AS. ryÞÞa, hryþþa, m. Their origin is not certain, espec. as it cannot be determined whether the initial h of the AS. word is permanent; we have probably to assume Goth. *ruÞja, m. Akin to AS. roðhund?.