This article is from the Basic Health Care FAQ, posted to rec.pets.cats newsgroup. Maintained by Cindy Tittle Moore with numerous contributions by others.
You will need to watch to make sure your cat does not try to pull out its stitches. Consult your vet if your cat starts pulling at its stitches. You might, in persistent cases, need to get an elizabethan collar to prevent the cat from reaching the stitches. Puffiness, redness, or oozing around the stiches should be also reported to the vet.
Some stitches "dissolve" on their own; others require a return to the vet for removal. Some vets, especially with male cats, may use "glue" instead, which works as well in most cases and does not require later removal.
You should note that male cats will take some time to flush all testosterone and semen out of their systems. There have been recorded cases of "neutered" cats impregnating female cats shortly after their operation. Three to four weeks is sufficient time for neutered toms to become sterile.
 
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