I'm looking after a friend's dog for a couple of weeks. She's an 8 year old lab cross and is very sweet-natured. She's pretty well-behaved - doesn't run off or steal food - so is quite easy to have in the house and she gets on very well with my animals. However she pulls horribly on the lead and doesn't respond to commands like 'sit' or 'go to bed'. I was thinking of teaching her a couple of things while she's here - any ideas what to start with? She's not particularly food-motivated (weirdly for a lab cross!)