Weedkiller is never fine! Besides it won't work where there are suckers popping up all over the place, you'll probably need to treat each one it appears. It's no less effort just to pull it out.
Chop it down, dig out what you can and cover it over, it'll soon die off. If you don't want to cover it over then keep an eye on the site and pull out any new suckers as soon they appear.
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Lilac will flower if left to grow big enough. Weedkiller is fine ince its dry and I doubt the cat will be eating the leaves anyway.
Weedkiller is never fine! Besides it won't work where there are suckers popping up all over the place, you'll probably need to treat each one it appears. It's no less effort just to pull it out.
Chop it down, dig out what you can and cover it over, it'll soon die off. If you don't want to cover it over then keep an eye on the site and pull out any new suckers as soon they appear.