it shouldn't be an issue unless there are areas of the server's source code that select all fields (via *) from the npc_types table and expect them to be in a particular order (or a specific field count). you also want to be aware that it'll probably make any gm (#) commands that might add entries to the npc_types table behave (or fail) unexpectedly.
you could make a separate table entirely and store just the id of any npc_type that you know is a pet. then when you're running queries, you can use "... WHERE npc_type.id IN (SELECT npc_type_id FROM known_pets)" as a filter.
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I muck about @ The Forge.
say(rand 99>49?'try '.('0x'.join '',map{unpack 'H*',chr rand 256}1..2):'incoherent nonsense')while our $Noport=1;
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