Please state which species you are refering to. I am aware of several different species of loach that are commonly called 'weather loach' and being different species they have different breeding criteria.
There is no sexual dimorphism in Clown Loaches. They are also very hard to breed. It seems they breed in large frenzied groups and only when they are fully grown. That is about 12 inches long.
Yes, they can. Just make sure you have enough space and soft gravel for their needs.
They are cool tropical fish so they do need their water heated to around 70F. No they do not hibernate. Weather Loaches are a very shy species. I had one in a community tank for about 5 years and never ever saw it until I had to clean the tank out and was surprised it was still there.
Needlefish, dojo loaches, kuhli loaches, ghost knives, etc.
No, Goldfish belong with goldfish with a few exceptions such as weather (dojo) loaches, apple or mystery snails, or bristlenose plecos; but only if you have a large enough tank.
Loaches are a actually both. They eat smaller animals such as snails, as well as algae and other growth.
I believe a breed of Dog used is called; "The Canadian Eskimo Dog", this breed also goes by other names such as "Gronlandshund, Inuit Husky and Qimmiq".
weather often changes everyday
An Oscar fish eats a loaches and any other small fishes check out the video's on YouTube you'll see
Goldfish should only live with goldfish with the exception of weather (dojo) loaches, bristlenose plecos, or mystery/apple snails.
often about 50%
A bitch will go into heat twice a year however its really only safe to breed her once a year. A male you can breed as often as you want.