I have 2 male neutered cats. A few times they howled and seemed very upset when they were inside the house, while a strange cat was outside the back door. Is it a territorial thing?

A definite yes. The neutering takes away the spraying to mark territory in most cases but does not eliminate the need to establish their own territory. I think cats are mostly little lions and will tolerate other cats in the same household or pride but will naturally want to repel others.

The howling is a warning. Quite musical if you are tone deaf. All cats are territorial.

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