Hello. I recently brought home a new male cat who is about 8 months old. I have a female cat who we are not sure how old but guessing about a year. Both are fixed. They of course took awhile to get used to each other. The regular hissing and growling of the old cat because I brought the new one into the family. They seem to be getting along fine now. They chase each other and play. However sometimes the new cat will walk up to the old cat and try to bite it's throat while she's sleeping or relaxed. Now they are both loving cats and neither would bite anyone. The new cat is a totally loving cat that I have never seen hiss or growl. Should I be concerned about him biting (or what appears to be) the others throat?