Try this next time Roofus brings his little buddies home.
1 cup liquid dish soap (I used Dawn for sensitive skin)
1 cup white vinegar
1 quart warm water
Directions:
Mix the three ingredients in a large bowl and then transfer to a leftover squeeze bottle (like an old shampoo bottle). Give it a little shake to make sure it is mixed.
Apply to your doggy just as you would normal shampoo. It is best if you can massage it into the fur and let sit for 5 minutes. My dog did not mind as long as I kept massaging the shampoo around.
Rinse your doggy thoroughly with warm water. Towel dry.
Do It And How 
will it work for cats?
I’m not sure!! And I’m not finding any resources to say not to either. If anyone knows of a reason to not use on cats, please let us know!