Monster Rancher (known as Monster Farm in Japan and Monster Gadget in Portugal) is an anime series based on the video game series of the same name. The series initially consisted of only 48 episodes; however, it was eventually decided to extend it for a total of 73 episodes. The series follows a young boy named Genki Sakura who gets trapped in the Monster Rancher world. Genki eventually meets a variety of characters that join him on a quest to defeat Moo, an evil entity bent on destroying the world.
Compared to other "pet monster" anime at the time, such as Pokémon, Digimon, and Yu-Gi-Oh!, the show had a more serious tone. Deaths and murders were frequent (although the monsters were not really "killed", they were turned into disks). Minor characters were usually given a tragic backstory, and even some villains were given depth. The show still supplied a sizable amount of humor, usually in the characters' mannerisms, in order to appeal to multiple age groups.
The Character Hare had his "Gas" attack cut out in America. "Gas" is an attack where Hare turns around and flatulates on his enemy. The flatulence stinks so bad, it stuns enemies, knocks them out, as seen in Hare's Trick and he used Gas to keep the Iron Bird afloat in the Iron Bird episode.
A couple of scenes were also lifted from the episode "My Name is Pixie". At one point during the episode, Genki rescues Pixie from quicksand. After he hauls her out, the mud on her face makes her look as if she has a beard (why that was cut out is not known). There is also a scene in that episode where Genki lifts Pixie "bride over the threshold" style in his arms and skates away with her while she kicks and yells in protest. For reasons unknown, a few frames were cut from that scene as well.
Several key episodes of Season 2 were skipped by some networks that aired Monster Rancher in the U.S. "Battle with the Big Bad Four" and "Tiger's Battle with Destiny" only aired once in the USA on Fox Kids. These episodes were probably considered too violent to be aired again as they were pivotal battles for Holly and Tiger respectively.
In the Spanish and English versions of the anime, the opening was recorded produced and vocalised by Anthony Lopez.
While not related to the English dub, there was an interesting change on the Japanese release's opening for Episode 1. Episode 1 had a different opening animation for the first opening than other episodes. The changes include:
There are also many other additional details added onto the animation.
There are also some similarities to the 4 TV shows, Monster Rancher, Pokemon, Mortal Kombat, and Yu-Gi-Oh!.
if you would read the names of some of the creatures that are both in the Animated Series and The Monster Rancher Game Series.
for example:
(Monster Ranchers) Raiden - The Raiden species is a creature that resembles a humanoid bird of prey as tall as a man. They are also masters of the air and martial arts.
(Mortal Kombat) Raiden - He is an elder god and he is a master of matial arts and specializes in the element of both Air and Thunder.
(Nya) Mew - They are small yellow stuffed toy cats and are one of the more popular species of monsters.
(Pokemon Version) Mew - A very cute and Popular Legendary Pokemon In the Pokemon Series.
Obelisk - looks like a stone wall. (also has the name of the Obelisk Stones seen all over the world. the picture below has Ancient Hieroglyphs on it.)

(YuGiOh) Obelisk - an ancient God card used in the ancient Egyptian Card game know as the shadow games.