Vets make more profit on vaccines than just about anything else.
And insulin, The watered down “Vet approved” pet insulin is $50 bucks for a U-40 bottle. The U-40 syringes and pet insulin can only be purchased through a vet or online from a vet supply. But the insulin has a temp issue when being shipped so it’s not a good idea to buy it that way.
U-100 Human Novolin N (which absolutely requires U-100 syringes)is 2.5 times more concentrated and only costs $25 bucks at walmart. So for $25 bucks it replaces the need for 2.5 bottles of the pet insulin worth $125 bucks.
And yes Novolin N is completely safe for use on pets, but please look it up for yourself. You just want to start with a 20% less unit dose then adjust up to good levels. Yep it’s a scam...
And that’s why our cats & dogs are vaccinated often to DEATH - because vets don’t care as long as they get money.