You are definitely right to think about things now.
I did a lot before our baby was born and didn't have any trouble with two dogs, one of which had been known to bite in the past.
Firstly we put stair gates any places we felt we may need to restrict the dogs and started getting them used to being excluded. I also taught a settle command, which meant go away and lie down. Every time I used this, I ignored the dogs completely and when they went off, threw a treat to them, they picked this up,very quickly.
A month or so before my due date, I got a recording from my NCT teacher of a baby crying. I had to record it a bit more, as it was only short, but then I would play this on low when they were eating, gradually getting them used to the sound, when something positive was happening. I also played this upstairs and they quickly ignored it.
I also carried. blanket held like. baby around with me on occasions and wouldn't let them near it, telling them to go way and settle. They sort of understood when I had the blanket they wouldn't get any attention.
Finally, when dd was norm, dp brought home a babygro and let the dogs sniff her smell, leaving it on the chair, so she wouldn't smell strange.
When we came home we had her in a carrychair and let them sniff her and once in the house put her on the table and made a big fuss of the dogs.
We never had any problems with them being jealous at all.