So here's our story my wife and I currently have three Daschunds and they are 16/16 and 13 years old so the rainbow bridge is not too far off in the distance

. The 13 year old is partially paralyzed in the rear legs we did surgery and therapy but it didn't work . So looking to the future we are thinking about the next dog ( singular ! ) being a middle sized dog . We now live in the country on 2.5 acres and would like a dog with decent manners but still bark/growl when strangers show up . We have three grandchildren that are still young ( 12 and under ) so we don't need a child killing breed

My wife and I have been married 40 years and in the past have had a Springer Spaniel , a beagle , a lab and daschunds and have enjoyed them all .
We want to stay away from breeds that need professional grooming so a Springer is out . And we think we want to stay smaller than a lab but we " might " consider a German Shepard or Doberman but probably want smaller than that . For 99 % of the time the dog will interface with just me and my wife . So what breeds would you recommend we consider ? We will do everything we can to rescue the dog from a local shelter but would like to have a few breeds in mind when we go looking , it's too easy to fall in love with all of them

Thanks in advance for your suggestions .