Yep, having this issue here, too. Completely fed up with it.
I really don't understand the lack of foresight when designing some of these "features". The abundance of sick pets is exactly what I was afraid of when this pack released with a veterinarian skill. Why are strays even allowed to be sick at all? Why do unplayed households and households not being currently played get sick animals? There needs to be a fix that only allows animals to be sick when playing a veterinarian, and then when a player switches households to non-veterinarian, all sick pets become healthy. In fact, maybe it should also be that all pets are by default, healthy, and the currently played household has like a 15% chance once per Sim week of becoming ill.
Also, the pet healing treats should become more readily available to buy when needed, and be able to be fed to any sick pet in the game by any Sim.
