Can sympathise, I combed Minmin the raggie out this morning, nearly 40 mins later and she was knot free - she is indoor/outdoor due to her pointing habit and I come home this evening and she is clumpy again, currently Robin is combing her whilst watching the football!
Oscar gets his 10 mins in the morning and he is remarkably ok and knot free, Phoenix my long haired ginger on the other hand brings the outdoors in and then some and has sticky burrs on his hind end so thats a bed time treat for me - he will only let himself be groomed on the bed so another 15 mins gone from the day
Boston and Dallas the ferals never have a clump or knot but they are house cats and nearly 3 so more good luck as we haven't got a chance of getting near with a brush its a merry cahse with the crush cage usually!
Miss gracie is clumpy but I think its her age and mouth issues so its a quick walkby with the brush which she hates but in her defence having lived outside till she was 15 and being feral its a wonder she is as sweet as she is!
Brodie is a demon in ginger fur but soes loved being brushed so he's a dream
Sky the Border Collie only likes to be groomed if Jazz is having a groom - he is longhaired she is short haired so it can be a pain to "groom" Jazz for 30 mins just to get Sky - Jazz is so tolerant for a pigs ear!!!!!!!!!!!