I’m afraid not, which is an odd thing to say, given that Kanto is a region home to a young man who’s both a breeder in his spare time and a rock specialist, and rockruff are capable of adapting to our climate. Nonetheless, there doesn’t seem to be much local interest in breeding rockruff specifically. However, because both of your pokémon are canines, you may have some luck in simply giving them a growlithe, houndour, or eevee puppy instead (which all are popular breeding subjects in this region). So long as it’s young and has similar needs to their species, they likely will still accept it as their own.