This is one of the most important things in our house - it is Liza's treat ball! I bought this about 9 or 10 years ago & it had a "trap door" where the gaping hole is & when you put treats in it you could control how easily they would fall out as the ball rolled around. Liza learned that if she rolled it down the stairs the treats would usually fall out which is why it looks this way. I have tried super glue etc. but it never stays together! It is sadly beaten & broken but try as I may I have never been able to find another one like it. I have spent hours looking & have bought many similar but nothing will ever take it's place. She knows where it is almost all the time - usually keeps it in her bed - but when it's missing she just paces the house until someone helps her find it.
She used to be able to hold it in her mouth like this by just hooking it onto her eye tooth
Now she just puts her bottom jaw into the opening like this
There is a ritual in our house every night at dinner time where she sits on the rug, with the ball next to her, while we eat. The minute one of us gets up to clear the table she picks it up & follows you around with those big brown eyes just begging for a "handout"! Of course we just throw in some treats & they fall right back out the "gaping hole"so there should be no challenge except she doesn't see so good anymore(poor senior citizen) but the nose can usually sniff out the ones that get away!