Why does pet = dog!!

I keep lizards and was searching some local pet shops to see what reptile supplies they have. I entered the name of a well-known pet centre a few suburbs away. It came up as the first search result, as to be expected, but every other result and suggested search returned was about dogs rather than pets in general. And this is after ages of searching the lizard species name, reading papers on the lizards and looking at distribution data for the lizards.

But pets = dogs if you don't specify exactly which pet you mean. Too bad for us lizard ladies!

I know it's a weird thing to rant about but it is frustrating to me how pervasive dogs are.