Mine also LOVE the Kong toys! Another huge favorite are the stuffed toys with squeakers- they enjoy "killing" them
they also like the rope toys!
Stay away from Greenies- i absolutely refuse to give mine those after I had to assist our vet in removing a chunk of a greenie that gave a dog a blockage. Also- Nylabones can and do break off into pieces and can be a choking hazard as can some rawhides/chews. If you must give a rawhide- give a pressed rawhide and only when supervised.
Whiskey really enjoys this http://www.dogtoys.com/nowowibe.html
he carrys it around the house all the time and plays with it (he's an older dog- around 8 yrs, and so far this is one of the few toys i've found that he actually really loves!). It's VERY durable and seems to really hold up! I would definitely recommend this for a puppy!
This one is another huge favorite around our house. Both Fosters and Whiskey LOVE it!!! (So does Jasmine the cat, even though it's huge
she's sooo weird!
she likes to lay on it) http://www.petedge.com/Tough-By-Natu...-Cuz-ZX318.pro
- one again, very durable and it holds up REALLY well!
Just keep in mind whatever toys you get for your sister's pup- make sure that she is there to supervise and toss out any toys that become small enough to be a choking hazard /or frayed.