How do you get a pet on runscape

You have to be a member in order to get a pet on RuneScape. You can get a dog at various pet selling shops which you can find at Yanille (near the Magic Guild) and Taverley (near Falador). Don't forget to feed it.

If you want other pets, you can catch them using your Hunter skill. Check the RuneScape knowledge base for more information on catching pets.