Yeh,  packet of Frontline has the same effect

wow this sounds an excelent toy, my cats sit around and sleep al day, (wel
so do i actualy but thats another matter), although they free to go outside
i suspect they just go and find a nice warm spot in the sun and sleep too
lol, of course when its cold like now they in doors al the time and sleeping
too, im woried they dont get enough excercise, especialy Polo my 3 legged
one who likes his food so much and is showing signs of geting fat and his
one fron leg hasnt realy got that much stronger to comepnsate he tends to
jump off chairs and land on his hind legs, bit like a kangeroo lol, i try
cut down on his food but then he brings me in mice, wich at least means hes
geting some excercise, of course i try put just enough food ouit for them
but Polo always eats whatever the other cat leaves.

i dont unfoirtunatly i dont have the energy to play with them that much,
this would be ideal as it would be efortless for me and potentialy lots of
fun and excersise for the cats. mine are both about 6-7 years old, and
quickly get bored of any new fluffy mice on bits of string etc.

meow =^.^=