Would like breed suggestions please for our family.

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We have considered having a dog for a long while now and have decided to wait until after our holiday in June.
We have 2 children and 2 cats. I will be home all day and our 7 year old has already started reading about what dog care is

Im not happy with a dog like a staff (althought there are tons in our RSPCA place). Would like a collie but know they need a lot of exserice and think we would only get 3 walks in a day.
We go camping on holiday so need a dog that would be ok to take with us, so nothing too huge.

Any suggestions? Are we better to get a RSPCA one or we have a small local resuce centre nearby too.
Would rather not have a puppy, but one that is house trained would be good, so thinking between 6-12 months old?

Any hints? We grew up with dogs but this will be our first as our little family and certainly has had a lot of thought.
TIA

I can't be much help on that score as mine was 16 weeks and housetrained. But I think I've read it is better not to use newspaper but to put them outside every hour. Think it has a bit in The Perfect Puppy by Gwen Bailey which is really helpful.

I'm sure someone who has done it will be along soon. My top tip is definitely clicker training (we use a word but same principle), makes training very easy, even for dog numpty like me !