Original post by Little Tail ChaserAnything you can get; small animal, farm animal, equine, exotics... single vet practices, hospitals, ambulatory vets... first opinion, referral... any of that would count. I'd advise at the very least doing some small animal first opinion and something with large animals.
Again, whatever you can get I would strongly recommend doing something with companion animal husbandry (kennels, catteries, shelters....), something with equine husbandry (e.g. a riding school) and a food producing farm (especially dairy work and lambing, but pigs and poultry are great to do if you can find anything). Aside from that there are lots of things you can do to set yourself apart from the crowd. Zoos, abattoirs and labs are the first few that come to mind, but anything with animals counts. Birds of prey centres, seal sanctuaries, dog grooming parlours, pet shops...
Anything you can link back to vet med. Your volunteering doesn't have to be animal related (although it is useful to kill two birds with one stone). Things like being a young leader at Scouts, St Johns Ambulance, volunteering in an old people's home etc etc are all examples of things that could involve skills required as a vet.
Fancy things make you stand out yes, but I would recommend focusing on the basics first. I got four offers without having been to any commercial pig or poultry places, but they are very good to get to if you can