You have an F2 female Bengal, which is not neutered (uber expensive, expect to pay something like £3k for her) and she is wondering around in the garden, in heat, mating with all in-sundry?
Are you sure about this?
In any case, the kitten in the bottom pic looks like a good example of a Bengal kitten.



Long term but not permanently, definitely 1+ year. I'm taking the dog whilst my mum is working abroad, she'll definitely be gone for 1 year but her contract may be extended for as long as 5 years.
In that case, you can't have a cat petrified to come downstairs.
You NEED to force the issue and in your presence have both animals in the same room. If need be, put the dog on a leash so he can't get close to the cat.
Another method is to keep the 2 animals separated by a door, slightly ajar. So that both animals can sniff eachother (1st introduction).
Another way is to get the blankets for both animals and switch them around, so that they both get used to the smell (pre-introduction).
Basically, you have to make the judgement call yourself. There is no wrong or right. You have to make the decision yourself.
Also, do not ever trust 100% an animal to behave itself. An animal can turn. Even the softest/cutest dog can maul a cat to death (or other small animal) to death.
As an example, I have an uber dominant cat and would never trust another kitten alone with it. I know that he is quite capable of killing another cat/kitten and I always keep an eye on what he is up to. He is a very busy cat. Again, this is judgement call that I have had to make. My Bengal on the other hand is a fraidy cat and hates the rough stuff, so I would have less fear of leaving him with a kitten or weaker animal.

Thanks for the advice, very much appreciated
e: As to the feliway I've never heard of that before and it does look interesting but is it suitable for a mix of animals ie dog and cat?
You can also give a Feliway diffuser a go.
I've heard of this.
Have you used it before?
Does it actually work?
... I have some on order to help introduce our new kitten to a household with dogs.
Let us know how it goes.
My friend had a cat which was urinating on his bed.
I think he bought felliway, but it didnt make any difference.
So, the jury's out.

Thread bump with another new (clearer) pic of my Siamese!
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Your cat isn't called Gizmo is she?
The only reason I ask is that face is almost identical to my mum's cat (and my auntie's cat, who is her sister). Mum's cat is grey like that and had a littermate who was grey and fluffy, and the family who took her moved away to I don't know where. Would be funny if she was!
Yeah the cat told the owner what its name was 
The black one with those piercing blue eyes is stunning. v v v jealous 
