MPR vaccinates at our vet. We do not use vaccines purchased at Tractor Supply or other home vaccines. We used to purchase our vaccines from ValleyVet - they came shipped properly in cold storage. We used to have a vet tech administer them properly. We stopped home vaccines entirely - even though it's cheaper. Short reason why: the benefits of vet vaccines simply exceeded the price difference and ultimately it's in the best interest of the animals to vaccinate at a vet.