I have 3 dogs, 12, 9 and 5, 2 x Beagles, 1 - Labradoodle
After the elder one had an ACL injury which cost us in excess of $900 my vet suggested we get insurance since these costs can mount up. So we did, about 2 months later the 12 year old grew a golf ball sized syst on her rear hind quarter which required surgery and labwork. This insurance kicked in and they paid a larger proportion of the costs.
I will never be without pet insurance again, ASPCA were very good to deal with and painless.