Sorry, but I think you’re right to be worried.
If your dogs have always been your priority, that’s about to change. Four dogs is bloody hard work (I had two with a toddler and a baby, so I sympathise)!
It’s great you care about them this much, but realistically things are going to change and it’s up to you to ensure you have the support system in place to enable you to still have that relationship with them (taking them out for walks whilst baby is with DP/parents/in-laws etc). Give them one on one time, adequately exercise them, play games with them etc. It’s 100% doable but it’s so much harder without a support system.
I worked it as this;
DP had the baby when I walked the dogs in the morning. I had the baby when he walked them at lunch, we went out together with baby after dinner. On days he had work (he dropped to part time for a year) my parents were around to help. If I wasn’t up to walking them (because being frank birthing a baby is exhausting - for months after I was in pain and tired - and no one talks about how bloody tiring that is on top of the pain and everything else) then my parents took the dogs out. If I didn’t have my parents then I’d ask a friend to walk the dogs (never a dog walker as I don’t trust them tbh). But I always made sure I put aside time each day for each dog.
Baby (later toddler and baby) came first, but I wasn’t willing to risk possible jealousy with my dogs because even though I trusted them, dogs do not always take to children and I wanted to do all I could to show my dogs I still had time for them. Assuming the dogs will be fine with the baby is very naive - and I really urge you not to blindly assume they will accept a baby.
Babies are demanding and so are dogs. It’s just important that you ensure you build in ‘you’ time with your dogs regardless, because it’s when people don’t do that when things go wrong.