I think that if you can walk them at least 10 to 15 mins a day that would be great.
I did see a C.Milan episode not too long ago. Two guys in Cali had 3 small dogs (tiny) and ALL girls and YES fights were breaking out EVERY day. Among teaching these guys to be the Alpha in the house, he said the dogs MUST go for a short walk EVERY day (20 mins max). And ya know what...the fights DID stop, the girls were happy
He said this is the order a dog should live by:
Exercise
Obedience
Love
I also think that if you can teach the girls a few commands, using positive praise and a good treat reward (I use Peanut Butter Chips from the baking isle) - that you CAN stop this
