Moving to a different country--> worried about pets.?

I currently live in south east England. Next year (summer time) me and my family are moving to South Africa, Cape Town. I have 2 dogs currenltly. They are both meant to be long haired, but I always keep their fur short. Their breed is Lhasa Apso and originate from like the Tibetan mountains and are proper cold dogs. Later this year/early next year I am getting another dog- A greater swiss mountain dog (NOT A BERNESE MOUNTAIN DOG), and they originate from the Swiss mountains. So they are all cold dogs but we are moving to a sunny, beachy Cape Town and I am worried about how they will adapt. Any tips/knowlegde about this? )Also if anyone knows anything about GSMD's pelase tell me anything you know about them at all) Will they do alright there?

I also have two cats and am planning to get two more sometime this year. My current cats- one is indoors and loves the sun but she is VERY anxious/stressed/high strung and always has been and has never been calm in general, let alone in new situations. She is 12, and will be almost 14 then, so I am very worried about how she will handle it all. My other cat is a thick furred, but not long furred, cat who is on the chubby side. But the thing I'm worried about is she lieks to go outside a lot and usually just spends her time walking around our garden and stalking things. But there are a lot of poisonous snakes/spiders etc in South Africa and we dont have much of a garden in cape town (patio, pool area, big balcony's) so I'm worried she will wander to the mountain/hill behind our house (like our back garden, but giant fence blocking us from it haha) and there are many creatures in that grass. I dont know what I'm going to do. What if she tries to hunt a rattlesnake or something and gets bitten? We also live next to a road here but its quiet but in Cape Town the road by our house is quite busy. What should I do?

My snake will just be chilling in the sun so I think he'll love it, but what temperature should we keep his container in? We keep it quite warm cause its cold here, but in cape town the temp varies a lot but not half as cold as here.

Thanks for any tips.