Endless Vet Bills

I'm just wondering if anyone is having the same issue with their cats on Sims 4.  My sim is living in Sulani and did have to cats until I finally got sick of this issue and moved them to an unplayed household.  They were getting bitten everyday by squirrels which led on to constant vet visits every other day.  Not sure if it happens in other worlds as I didn't try moving before I sent them packing.  Any ideas?  I have no mods.