William R Moore,
You COULD have had my problem, from my long ago days/DAZE of grad school: I had a >20 pound Maine **** cat, that I adopted from a shelter, who seemed to see it as his LIFE MISSION to SEVERELY PUNISH all dogs for being alive.
After the THIRD time (I tend to be a "slow learner" on some things.) that I paid a LARGE Vet bill for "injured dogs", I started keeping him in the house, unless April and/or I were at home.
(ONE of those injured K9s was a >80# German Shepherd bitch that "ventured, uninvited, into "Dutch's" territory and had to have over 100 stitches.)
yours, sw