If you're looking for manga similar to Ginga Densetsu: Anju to Jiroumaru, you might like these titles.
A big, fluffy Samoyed Dog called Potemaru and an office lady named Hitomi live together. They live in an apartment that is roughly 6 tatami big (10 square meters) but the building has a garden, which is used as a dog park. Follow them through their everyday life.
Lovely Muco! is a story that depicts the lovely everyday life of Komatsu-san, a glassmith, and his pet dog Muco. Shiba breed Muco's wish is that Komatsu-san could become a dog!
Lassie was born in a petstore and sold numerous times, but had not found his true master. Lassie helps a store employee named Asuki and finds the right match. However, he is sold again before Asuki can take her home. Subsequently, Lassie has many adventures trying to be reunited with Asuki.
Two adorable kittens and an older wounded cat have little adventures in the country home of their gay owners.
Stories revolving around the unforgettable dogs in the characters' lives -- the joy they bring and the sadness that comes with parting.