When anyone mentions bones or obsessiveness in a bad light it's important to ask 'em 'why'? you never know your luck you just might find they don't actually know what they are talking about and are masterful @ Freddie Parrot impressions. Obsessiveness with a ball can indeed be bad (not bad mentally like a deprssive dog chasing it's tail) cause they will when handled by dickhead run themselves till thier heart pops
...that's where the handler comes into the plot, once you know what it wants you can formulate the want into a straight trade 'in your bed, out of your bed, sit steady' ( in ever increasing increments) etc etceterrar.....and that in any lingo is a +++
Had an husky nail me terrier a couple of yrs back, the husky was 50yds ahead of it's owner and ran 50 yards to pay the compliment, i sorted it out and the owner eventually arrived to discover his mutt had a cut ear, apparently we had to go the policemen-bill shop to see what he made of the cut (i kid you not). I instructed the owner to walk to the nearest boundary wall and pointed to the fella stood in the trees silent with a rott sat looking at him ('you've guess ain't ya') and told him to release his dog and have it charge Mr.Rotty...he told me to feck-right-off the rotty would kill his dog and naturally i asked him was it fine and dandelion for his dog to only perform the move on 1ft terriers...i think he sensed the trap....that or me kite belied what me next course of action was going to be....he touched lucky....me tea was ready. When me dog is fifty yards out from me...i want it back at me feet pronto stylee...the easiest way to acheive that is putting it into promiseland with the humble ball...that way i circumnavigate a dog simply refusing to be leaded-up for the offmans or the one specific to collie's having it play stalk the handler...especially with tattoo'd husky pricks heading my way cause 1ft dogs are thier barra.....'simples'.