The fact that the rats were IN her garage is evidence that she doesn't have a rodent-secure building. For a house, all ingress points should be covered with mesh like soffits, dryer vents, etc.
And what drew the rats to her garage? They are usually seeking food (garbage?) or water.
We had a horrible rat problem at our previous house. We saw rats for years before they actually affected our chicken area. Because sometimes we didn't have chickens, and for the longest period we had just one small flock.
There were two big farms (one with hogs) nearby, and a neighbor who collected junk cars and fed their dogs outside. We knew he had rat problems for years because of the random shooting at nighttime they had to explain to everyone.
Only after we scaled up our chicken operation did the rats come over for the spilled feed that was hard to clean up, multiple water stations, etc.
I found it helped to not only lock up the feeders, but dump all the water sources every night. Poisoned, trapped, but the numbers were ever increasing. Whatever we did, they could just hop over to the neighbors to survive until some chickens made a mess again.
Nevertheless, in winter, we got them in the house, and that's a hundred kinds of horrible. The house should have been secured against rodent infestation, but there were multiple ingress points not addressed by the homeowner even after we told them about the problem.
Moral of the story: Everyone in a community has to take measures against rats. They shouldn't have housing, water, or food at any location.
And what drew the rats to her garage? They are usually seeking food (garbage?) or water.
We had a horrible rat problem at our previous house. We saw rats for years before they actually affected our chicken area. Because sometimes we didn't have chickens, and for the longest period we had just one small flock.
There were two big farms (one with hogs) nearby, and a neighbor who collected junk cars and fed their dogs outside. We knew he had rat problems for years because of the random shooting at nighttime they had to explain to everyone.
Only after we scaled up our chicken operation did the rats come over for the spilled feed that was hard to clean up, multiple water stations, etc.
I found it helped to not only lock up the feeders, but dump all the water sources every night. Poisoned, trapped, but the numbers were ever increasing. Whatever we did, they could just hop over to the neighbors to survive until some chickens made a mess again.
Nevertheless, in winter, we got them in the house, and that's a hundred kinds of horrible. The house should have been secured against rodent infestation, but there were multiple ingress points not addressed by the homeowner even after we told them about the problem.
Moral of the story: Everyone in a community has to take measures against rats. They shouldn't have housing, water, or food at any location.