Dogtanian and the Three Muskehounds, or 'Wanwan Sanjuushi' was one of my childhood favourites growing up, I constantly watched and rewatched it! I just rewatched it again recently to live out my youth and it is still as good as I remember. However, I feel like it's something you can only truly enjoy if you have the nostalgia with it.
Story: 10/10
I always loved the story, it's a take on a book written by Alexandre Dumas from the 1800s. I think it is portrayed well and the pacing of the story is also very good. It is not rushed and seems very well thought out. Though, I have never read the original book so I have no idea how loyal it is, but as a standalone it is great. The different plot points are awesome.
Art: 9/10
I rate it highly due to nostalgia but the animation is quite simplistic and inconsistent. Though I think that adds to it's charm. The backgrounds are all very beautifully drawn and the character designs are also great.
Sound: 10/10
The music in this is AMAZING! I have ALWAYS loved the theme tune and it is so catchy. All of the background music is also perfect. Would highly recommend just for that on it's own. The voice acting could have been a little better, as a few characters sound stale, but I think it works fine. I only saw the English dub, it being on when I was younger, so I am not sure if it is the same with the Japanese dub.
Character: 10/10
I ADORE the characters in this! Again, may just be nostalgia talking, but I think they are all very unique and thought out, all with different personalities. The villains in this are also amazing and I adore them.
Enjoyment: 10/10
Honestly, there is nothing I would change about this whole experience. It is an amazing watch. Perhaps the voice acting for some characters could have been better, but I only saw the English dub so no idea how it plays out in Japanese.
Overall: 10/10
An amazing show, but only truly enjoyable if you watched it as a child, and are now revisiting it. I had no idea it was counted as anime until I saw it pop up on this site, so that is also really cool. I highly recommend you watch it. It is very child-like, as it is meant for small children, but the designs and story are really good still. I would personally recommend the English dub, but I'm sure Japanese or any other dub is good too.