And we'd have to spray Rhiannon, horses could catch it as well.
Leaving the surgery, we didn't know what to think. Was pyroplasm such a killer? And yet dogs were so common, most farms seemed to have at least four. Did they spray them regularly? Were they vaccinated? We greatly doubted it. But to read the literature you couldn't imagine a stray dog surviving in the wild for more than a few months.
We decided to investigate further.
Over the next few weeks, we introduced pyroplasm casually into every conversation, hoping to hear comforting words like - it's not a serious problem, you can spray if you like but we never have.
Instead we heard about dead pets and dogs saved from death by last minute ministrations from the vet.
We couldn't find a dog owner who hadn't had first hand experience.
Shelagh's first, second and third thoughts were to leave for England immediately. She'd had enough. If she'd known that she was endangering her animals by moving to France she'd never have come.
That gradually gave way to a ban on Gypsy's walks into long grass, woods or any other suspected tick haunt. And the pyroplasm leaflet became bedtime reading - ideal material to keep you awake while awaiting an imminent cat fight.
In early April, the worst happened. Presumably, having survived the cat fighting season, we were due for our next test. And what a test it was. Gypsy wouldn't eat her dinner, wasn't interested in biting my leg and decided to spend the day crashed out on her beanbag.
Out came the thermometer. And then in went the thermometer. Even that didn't seem to bring Gypsy out of her lethargy.
It was over 40° C, way above normal. And her eyes and gums were pale and anaemic - Shelagh knew all the symptoms of pyroplasm off by heart by that time.
She called the vet and made the appointment before thinking the next stage through. How were we going to get to the vet? In early April we were still waiting for the papers to come through for our car, to drive it would be illegal.
But there are laws and there are laws. And untaxed driving was not one recognised by the provisional council of the Kennel Club when an animal's life was in danger. And I greatly suspected that murdering one's husband if he objected was viewed as justifiable homicide - if not obligatory.
I drove into town, trying to exude a law-abiding aura while deep down feeling like an axe-murderer with a boot-load of severed heads. Every car on the road screamed - unmarked police car - every person - detective on stakeout!
Once in Aurignac, I thought I'd find an unobtrusive parking slot - maybe sandwiched in between two large lorries or buried in someone's back garden beneath a pile of leaves.
But Shelagh would have none of it. We'd park as close to the vet's as we could, Gypsy was too weak to walk far.
(next instalment: the police, the chase, and the wife)