Should I, or is it tacky?

I have an aged authority niche website about a specific dog breed. The url has the name of the breed in it.
Would it be tacky to write about other dog breeds on it?
I might be able to pull off a few pages on “other teacup breeds” but I feel like it would just look off.
Kinda need someone to tell me it’s a stupid idea here.

It's still dog related though. Just make comparisons to the breed of your website choice.

Well considering most dog enthusiast have more than one dog, I don't really see a problem.