Personally I am not a fan they are after all a hormone injection,pyometra can occur with such injections, as well as extending seasons.
I have heard of bitches wombs getting thin and that some bitches never get into pup after having their bodies messed about with.
Can’t stand people that think shows are the be all and end all.
My old vet would not even keep these drugs in his surgery, I am sure there must be dogs that go on OK after these drugs but they are not in my circle of friends
Val