To not pay the charity?

[helpmeout6]

Name changed as outing.

I adopted a rescue dog through a charity 18 months ago, she's the love of my life. I now volunteer weekly for the charity to help where I can.

From the same woman, who had moved to a different charity, a middle aged dog was available after her family backed out. I was told that the family had backed out whilst she was en route to UK (from a European country with a bad rep for dog treatment). They would have had to pay her costs to have her on the plane, I know this as the set up is the same as the charity I volunteer for and had all the training for.
The dog went to emergency foster in UK and I felt a connection so agreed to adopt. The dog came and it's been tough but we will persevere.
Almost 2 weeks after having her I get a text from the woman saying my outstanding fee is due, it's in the hundreds, the fee to fly the dog from the country.

I don't think I should have to pay because

1. I asked about a fee and it was never responded to or mentioned again
2. I didn't get the dog from abroad, I got her from the UK
3. if we had been told about the fee we wouldn't have adopted. Partly we can't afford it (DH has lost 1/3 of his income due to C19) and also we took the dog in as she is less desirable than a puppy so I knew demand for her was small, she needs a lot of vet treatment and also I wanted to give her a good rest of life.

So who is in the wrong?
I feel guilt as it's a charity but I do my part for the charity and it's not like I'm trying to get a free dog I just don't think it's been arranged well.

You say you work for a dog charity, so you know how these things work.
Ppl are assuming its a scam, but there are many charities who work liker this. There are not professional organisations but staffed by ppl offering there time and services for free.
If you cant pay, tell them and see if you can work it out. The charity will be for the dog and if they can get it a good home that will be the most important thing, but the more money they can get the more other dogs they can help and if you have ever been to these shelters you will know there are hundreds of dogs who are suffering.
Not paying because you cant afford it is one thing, having a list of reasons for not paying on principal is another and if you are more in the latter camp than shame on you.

@Cheeseandwin5 why should the OP be ashamed for not wanting to pay on a principle? She is not obliged.
The charity may have the best interests of dogs in their hearts but if they don’t have the means gained legally, through donations, they shouldn’t embark on financially demanding operations, such as bringing dogs from abroad.
Charity or not, have a legal binding contract where the adopter consents to paying the fee or fuck off.
There is no excuse for trying to blackmail the OP to pay for something she never legally agreed to.