Because dogs are natural predators of rats, their scent will scare these unwanted creatures away if you place dog hair or urine where rats congregate.
Ha, that's a laugh! They're not scared by my four predators!
The small holding we purchased had a guy on it who also bred and showed Kerry Blues.. During the second visit to the prospective seller I opened a top stable door to find his prized Kerry Blue stud mutt curled up fast asleep on a pile of straw up with a bit fat rat snuggled in by its tum.
It took one look at me and lazily ambled off into a corner and then went down a hole.
Once we got there one of the first things I did was use my electric mixer to make up a barrel of corn , crushed barley , pin oats , a tin of coca , 1/2 litre of corn oil mix along with three measures of a lovely red substance called " Dratt poison " ( had to sign the poisons register and have proof of ID ) This first batch of poison lasted just over three weeks , they were eating it like popcorn on a Saturday night. I ended up making several more mixes before we could consider a fairly rat free set of buildings and land .
Once we reached this stage we still had some 40 home made bait stations around the perimeter fences and along several buildings walls , they were checked and restocked as needed at the end of each month even when we finally reached the stage of no apparent takes of the bait .
Had we not done the rat treatment scheme & kept it up they would have eaten us out of house and home by eating the animal feedstuffs & ruining things .