I've just soaked some of her biscuits and stuffed them in but she seams to have gone through them after 5 mins. dont want to spend money getting the kong biscuits as they were a bit expensive so any other suggestions gratefully recieved.
Yes defo peanut butter - especially when frozen for 12 hours drives them wild! Cream cheese to stick bits of kibble in Wedge carrots or debtastix in there Anything that is safe for dogs and fits - they are great!
Mine get (value) smoked mackerel whizzed up with (value) cream cheese, smeared on the inside with some kibble wedged in, or some sardines mashed up. Or peanut butter/cheap pate/squirty cheese, but my dogs are prone to putting on weight, so I try not to make it too calorific. I have to make them easier for the older dog, who just sits and looks confused at the Kong if the food won't come out, and pack it all tighter for the younger dog who employs quite a fearsome suction technique.