I have 2 signs for situations like this. Right now they are in my room, but if I ever move out on my own they will be displayed in prominent places.
One says:

This house is maintained
For the comfort and security
Of my dogs.
If you cannot accept that
Then you can not accept me.
So Go Away!

The other one says:

These are my dogs
This is their home.
From which I hope
They'll never roam.

These are my dogs
I love them best.
This is their home
You are their guest.

So if dogs to you
Are just a peeve
Then by all means
Feel free to leave.

I just love these signs