Tracy, Regardless of whether the vet actually gives an injection or not, make sure you get them to show you how to give injections yourself. There are two types; sub-cutaneous, which goes in just under the skin, and intra-muscular, which goes deep into the muscle. Make sure they show you both the correct sites and method for each type of injection, since this will save you many a call-out fee in future
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Our vet charges much the same as Possum's BTW.