These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternative Character Interpretation: A good lot of this over Weed. Is he a naive, yet still effective leader whose morals are needed in the kind of world he lives in, or is he just a textbook example of Good Is Dumb who wouldn't have lasted five minutes had he faced Akakabuto with the same kind of mindset?
Angst? What Angst?: Weed spends about a minute mourning his mother's death before getting super excited about going on a journey to find his father.
Anvilicious: Oh boy... don't get started on Weed and his morals...
Ass Pull: Some find Hougen's death by lightning to be this.
Base Breaker: Good Lord, Weed. There are those who see him as a naïve brat who forgives his enemies way too easily and mostly rides on his father's coattails, and then there are those who think that he actually has a point with his morals and is, overall, a fine character even if he didn't happen to be the son of Japan's most famous dog. In short, one should be very careful when voicing their opinion over him.
Contested Sequel: On one hand, Densetsu Weed appears to be more noticed and recognized than its predecessor because of having newer animation versus the "old school" animation of the latter. On the other hand, fans who've followed the franchise since its beginning tend to lean towards Nagareboshi Gin as the superior installment, for having more "charm" and being more memorable overall than Densetsu Weed (while its animation is ironically also more fluid).
Damsel Scrappy: Many fans dislike Reika for her role of "Just There" in the anime/manga and getting kidnapped. Other fans believe Reika has redeeming qualities and manages to get some slack from the fans because of that. The same cannot be said about Koyuki, Weed's mate who only appears in the manga and seems to serve no other purpose than to give birth to Weed's puppies. Unlike Reika, Koyuki is universally hated by the fandom.
Fridge Horror: Bat has these weird-looking marks on his eyes that looks suspiciously like scars. His blindness could be not genetic.
Fridge Logic: Early on, the dogs make a deal out of how they'll be recruiting young dogs for a new generation of Ohu soldiers, because the previous ones have gotten old (or are captured). However, Ken and Tesshin were born back in Nagareboshi Gin, meaning they're at least 10 years old, no more than two years or so younger than Gin, which is basically the equivalent of an old man in dog years. Kagetora as well is shown to be best friends with Ken and having known him for a long time (more clearly pointed out in the manga), implying they're roughly the same age.
It gets worse when you learn that the average lifespan of a Great Dane is 6 to 8 years. Both Ben and Ken should have been dead ages ago. Artistic License – Biology might be at work here, but it's still rather mindboggling how Ken is portrayed as a young dog, specially in the anime where he's as old as 14 years.
When John is being tortured to death, the focus for some reason shifts to Hiro worrying about him, who'd all but known him for a few hours, instead of what would appear the logical choice and have the focus shift to Gin's worry, because hey, aren't he and John the ones who've been best friends and companions for more than 10 years?
Hilarious in Hindsight: When the dogs first meet Hougen, he takes a dump and tells them he will let him go if they eat it. They get offended and disgusted, as you would expect, until you realize many dogs in real life will readily eat poop.
Howling dogs in the sad scenes, such as John's death, sound more like humans screaming or coyotes barking instead of the true dog howls. It seems that the animators, writers and voice actors of the anime just didn't care.
Likewise, the strange trumpet melody playing during John's last moments feels a bit unfitting, more like it's a melody trying really bad to sound sad, and failing.
Just one of many moments ruined by terrible animation: Tokimune's death at Kaibutsu's jaws. No, not the actual death - a shot of Weed screaming "Father!" looks like he's having a friendly conversation.
Narm Charm: Despite having ridiculous amounts of Narm, some people still find the anime watchable, even enjoyable.
It depends what episode you're watching, really. There are a few well animated ones.
John's torture to death. Especially in the manga,in which his intestines not only get ripped out by Hōgen but are bitten in half by John himself.
Replacement Scrappy: Jerome's helpers were hated by most fans for replacing the manga characters who were cut out from the anime. Though Ryo did have fans for being an Action Girl (which is rare in this series).
One of the most hated changes would be Gin's original silver fur and brown eyes being changed to blue fur and blue eyes just so he would match Weed.
They Wasted a Perfectly Good Character: At one point, a female warrior (Ryō) appears. Until that point, the only female fighter in both anime was Cross, and she was rarely shown fighting. It would have been interesting to see a female that can actually fight in a cast full of males, but Ryō quickly becomes a Damsel in Distress instead and is not heard from again afterwards.
Tropes used in the Manga:
Complete Monster: Shōgun, the (literally) Ax-Crazy ruler of the monkeys and apes, is a vicious tyrant who will kill anyone and anything that gets in his way, or even if it's simply in the area to vent frustration on. However, what sets Shogun apart are his eating habits. When he's hungry, he just wrenches a baby out of the arms of its mother and takes it to his private lair to devour. He particularly enjoys drinking a mix of puppy blood and liquor.
What Do You Mean, It's for Kids?: While the anime is rather toned down, the manga consists of several gory fighting scenes that borders on Seinen territory (no censorship of ripped guts, limbs or testicles here). The main characters being dogs instead of humans might be why it's allowed to be a Shounen.