Whoops, I called Maggie a "he". My dogs hate it when I do that . I have 5 dogs, my youngest is a Doberman. He's 2 years old, and like you said, will probably take another year or two before becoming an adult. I don't want him to hurry too much, I adore his antics. Oh yea, then there's Nip and Tuck, my two rescued litter mates, (Manx), now about 10 yrs.
Now I need to ask what muscovies are??? 10 sounds like a perfect number, (if they're not too large)
And then there's the chickens. No matter how I "plan it" I end up with at least one rooster when acquiring chicks....then I decided I would get an adult so I don't try to introduce yet another rooster. That's when I got the hen who is a carrier of Infectious Coryza. I probably gave over 50 antibiotic shots, but everyone is fine...for now.
I'm in the process of building an ICU addition to the coup, so when the Coryza raises it's ugly head again, I'll be able to keep the sick ones outside instead of the bathroom or utility room. (I need to be able to easily catch them to give the shots) Also, since that flock is officially closed, I'm building another coop far away from the first. Coryza spreads through poop, water, and close contact to the sneezing. I have 6 Easter eggers growing up too quick in the Utility room, and I won't be able to take them out til the new coop is done. This is my first experience with chickens, and I must admit, it's been quite an education.
I also have a horse and a donkey. I've always wanted a horse and when exploring information about them, discovered that donkeys are Excellent Guardians. (Something you might want to consider for the chickens) The horse and donkey totally ignore chickens, but would be deadly on chicken predators, except maybe raccoons.
The GP/Lab sounds wonderful. He's bound to be a wonderful pet, and the Lab part will guard the people, and the GP part the chickens. Most Excellent!