That depends entirely on the type of tin,
If it is one of the old fashioned ones that need a tin opener to access the contents,ie "quick release", or if it is the newer type with the built in thumb puller,ie quick release
.Totally different effects will be felt, depending on your choice of tin.I can't stress how important this is.
Its vital to get the type that suits your dog.
eg Fast away dog = quick release tin.Slow away = slow release tin
.Always check the tin
Hope this helps.
Thanks,i sometimes take a tinned fray bentos steak pie aswell