They believe the trio are dogs because in Pokemon Version Gold and Silver they were called "Legendary Dogs". Most people believe they are actually feline because they do, actually look like cats.
2nd Opinion - I myself though believe they are to be cats.
3rd Opinion - Most fans have referred to Raikou, Entei or Suicune as either dogs, cats or beasts however the official Pokemon site has officially classified them as beasts however the reason why they were called dogs by some fans is because it was stated in the game entries that whenever an Entei roars a volcano erupts somewhere and cats aren't typically known for roaring (there's only 4 species of cat that can roar - lions, tigers, leopards and jaguars) usually only dogs are, Suicune because it's a Water-type and enjoys the water which is something that some dogs do enjoy but cats are typically afraid of water and in the case of Raikou some game entries state that it is capable of roaring.
There is actually nothing you do with Entei, Raikou, and Suicune (Being a legendary dog-catcher myself,). Just the pleasure (Not really) of having the three.
You chase Entei and Raikou across Jhoto and you catch Suicune at the top of Cerulean City.
Lv. 40
Entei, raikou and suicune
Umm i think there are three: entei, raikou, and suicune. but its probably just suicune
raikou
Starter:Charmander-Suicune Squirtle-Raikou Bulbasaur-Entei
Entai = Fire Suicune = Water Raikou = Electricity
There is actually nothing you do with Entei, Raikou, and Suicune (Being a legendary dog-catcher myself,). Just the pleasure (Not really) of having the three.
Raikou is best because entei and suicune are fegget Raikou all the way 2 reasons He is way cooler then Entei and Suicune. Number 2 he could whoop Suicune and Entei in a battle So suicune and entei are good but overall raikou is better
Entei, Suicune, and Raikou are not available in Pokemon Emerald, Ruby or Sapphire. They can be brought into the game by trading.
try to answer thoughtful
Entei Raikou
You chase Entei and Raikou across Jhoto and you catch Suicune at the top of Cerulean City.
You get suicune,raikou,or entei depending on your starter pokemon (charmander = suicune squirtle raikou and bulbasaur entei) and you can get mewtwo in cerulean cave
You can't unless you have joto
Suicune, Raikou, and Entei