Hi there!
I am a bit of a guinea fowl evangelist, so bear with me.
We hatched ours out and handled them, talked to them every day and now they just hang out in an 80 foot radius around the house and gobble up all the bugs they can find. They nest on the
chicken coop fence at night. They are, like all fowl, strongly habitual and can be trained with consistency and reliability. Dog trainers will do clicker training with
chickens and guineas are not so dissimilar from them in ability and temperament. I just found, for us, that handling them, given them special treats, and raising them from young babies was advantageous for us.
They get used to their environment for sure, and with older birds you might find a bit of loudness (think undulating, mechanical screeching noise starting at 5 am and persisting at random intervals throughout the day until nightfall). The ones we raised from hatch only screech when someone new shows up at the farm or they are hungry or I'm blasting Shakey Graves while working in the garden. Mayhap they regard him as a kindred spirit? It will take a bit of time to train the older ones but just do the same thing every day with them, talk the same way, use the same words, treat with the same treats and they will attach to you.
I have found they don't go near water. But they will go into roads. In front of school buses. They will also sit on rooftops. And nest in
trees.
A small chicken
tractor that you can move easily around your
yard will give them lot's of access to ticks and
fleas. They don't scratch like
chickens do. But they will dust bathe and like to frequent the same holes of dirt over and over. Once they attach to you and know you carry all the treats and they can rely on you, they won't wander too far. 6 weeks is a good time period to keep them penned up to build that attachment to you and your
land, for sure.
I know some people can't stand them, but I think they are hilarious and look prehistoric and we haven't had to use NEARLY the amount of flea treatment on our dogs since getting them. I think with some time and patience the older ones would work out great.
Also - I'm so sorry about your dog!! Poor, sweet baby. Lyme disease is no joke.