In his Sefer HaMidot, chapter Achilah, chelek sheni, paragraph 9,
Rabbi Nachman of Breslov wrote:
“He who is bit by a dog, it is known that the mercies of
[G*D Who dwells in] Heaven have departed from him,
and it is also known that he has stumbled with forbidden foods.”
The Sages [chachamim] prohibited the raising of pigs,
in every place, and also dogs,
unless it is restrained with a chain…
and the Sages said:
A curse on those who raise dogs or pigs,
because they often cause damage.
efshar, kayin having a dog isnt a medrash rabbah, it’s in a sefer from an acharon on chumash, based on the idea that when the malaach hamaves is near, dogs cry, so kayin would know when to flee
Make a statue that looks like you and let your dog use that for chewing or try a soft fluff statue that looks like you for him to chew on and soon he will learn the difference between you as a human being and his chewing statues