When I read that Murphy Anderson died I first thought of this series. I don't know why. But his name was tied in my mind to these characters. No where mentioned in all the RIP notes on his death.
And I couldn't remember the actual name of the characters. Took me some effort to google it. Several false paths. One thing I didn't remember until I found this page- They rode on giant Dalmatian dogs!
There were only 15 stories. I bet I read at least half of them.