Our dog trainer also suggested tubes of cheese to save bending down in clicker training and bringing to heel. Also helped with the children as they were worried that they'd loose their fingers giving little titbits of cheese (and they didn't like smell on their hands).
However, a word of warning, probably best to label it as the dogs!
Yes, my OH came home and was merrily using it for his sandwiches and only later learnt he was sharing the dogs slobbered over tube - after I questioned how quickly it get used up!
Face was a picture though!
He still doesn't walk to heel but the dogs are better!