@mrt1981
A few things to say about payment plans..
Most practices will on occasion extend payment plans and, believe me, pretty much all vets would love to be able to hand them out to anyone who asks. (We actually genuinely do love animals believe it or not!!) The reality, however, is that when a practice agrees a payment plan we know than a large proportion simply do not pay. This is not sustainable in large numbers for a functioning business which you want to be there for you and your pets, day or night with qualified, alert staff and all of the up to date equipment and drugs your pet may need.
Secondly, there is a high chance that the vet dealing with your pet is not in a position to offer any such thing. I have been working as a vet for over 20 years and as I do not own a practice nor am I in a managerial position I am unable to offer payment plans. I can ask management (and do) but I cannot make that decision myself. It is out of my hands.
I do try to advise people as much as possible on choosing insurance and suggest they check the details of any policy with respect to amount covered, excesses etc when comparing policies. Moving forwards I will try to find time to also ask they consider how they would cover any delay in payment. As above though we are limited as we cannot recommend (we're not insurance brokers..)
Moving forwards I would suggest it is risky to rely on your vets offering a payment plan in the event your pet needs expensive care. Other things you could do to prepare for the worst eventualities would be to have a conversation with your practice - many DO accept direct claims, at least from some insurers. If no direct claim from your own (or any) insurance can be made a dedicated "just in case" credit card is, as PP suggested, an ideal option to bridge the gap. Even having a family member you know you could ask for a short term loan in a true emergency is a plan.
For those in significant financial hardship the PDSA and RSPCA have clinics which you may qualify to attend. Some local animal welfare charities may offer some help in emergencies too. It's important to remember they have limited funds though and cannot help everyone.
Thinking ahead is really important. When it really matters and an animal needs urgent care it is truly heartbreaking for money to be a deciding factor. Planning for theses scenarios is part and parcel of being a pet owner and not the responsibility of the attending vet. Remember too that if your practice uses a dedicated out-of-hours service you should check their policies too.
Regardless of what arrangements you put in place I hope you never need them!