When I first got my cat a couple of years ago, I made the mistake of buying lots of expensive toys thinking he would like them, only to have him completely ignore them.
Since then we have found that he doesn't like anything that makes a noise when it rolls around (he tends to run away from it if we do that
) and we can't let him have anything with feathers or ribbons or anything hanging off it as some killer instinct seems to come out in him and he tears it to shreds 
(My MIL spent ages making him a big pom pom as a welcome present shortly after we got him which he loved, but I made the mistake of leaving him alone in the room with it for a few minutes and when I came back in there were bits of wool everywhere and he was sat in the middle of it all looking at me as if butter wouldn't melt 
)
So until recently the only toys he seemed to like were fluffy balls things which he liked to run around after...and then we bought a laser pen from the vets for him.
At first he didn't seem that interested...the first time my husband put it on he watched the red dot moving around but didn't really make much of it. Great, I thought, more money wasted. We left it for a couple of days and then my husband put it on again and this time he did show a bit more interest in it and actually got off his backside to have a look at it, although he still wasn't going for mad for it.
And then, I don't know what's happened, but in the last couple of days it's like something has clicked in his brain and now he goes crazy for it. He runs around like a mad thing after it, jumping on it and pouncing whenever he can and when we turn it off he spends a minute or so looking around trying to work out where it's gone (which I do think is a bit cruel, although my husband finds that extremely funny).
So I think I can say this one has been a success (and it's also good for him as he does need to lose a bit of weight).
So what's your pet's favourite toy?
Since then we have found that he doesn't like anything that makes a noise when it rolls around (he tends to run away from it if we do that

) and we can't let him have anything with feathers or ribbons or anything hanging off it as some killer instinct seems to come out in him and he tears it to shreds 
(My MIL spent ages making him a big pom pom as a welcome present shortly after we got him which he loved, but I made the mistake of leaving him alone in the room with it for a few minutes and when I came back in there were bits of wool everywhere and he was sat in the middle of it all looking at me as if butter wouldn't melt 
)So until recently the only toys he seemed to like were fluffy balls things which he liked to run around after...and then we bought a laser pen from the vets for him.
At first he didn't seem that interested...the first time my husband put it on he watched the red dot moving around but didn't really make much of it. Great, I thought, more money wasted. We left it for a couple of days and then my husband put it on again and this time he did show a bit more interest in it and actually got off his backside to have a look at it, although he still wasn't going for mad for it.
And then, I don't know what's happened, but in the last couple of days it's like something has clicked in his brain and now he goes crazy for it. He runs around like a mad thing after it, jumping on it and pouncing whenever he can and when we turn it off he spends a minute or so looking around trying to work out where it's gone (which I do think is a bit cruel, although my husband finds that extremely funny).
So I think I can say this one has been a success (and it's also good for him as he does need to lose a bit of weight).
So what's your pet's favourite toy?