red deer - no problem. i creamted my 2 cats and will fire my dog when the time comes.
i used a kiln for one, and a portable raku cloth kiln for the other.
i went to basic red - wasn't concerned on the cone. i used a wide brush to gather the guys up, and have them in a jar waiting for their brother the dog.
i saw no problem with flux, etc. simple ash dust.
way back around 1995 i checked into creamtion in general as a business potential, and was told by the california funeral directors association that there are no regulations for pet creamation, only humans. this was confirmed from several pet cemetaries i talked to as well.
i fired the guys on a basic kiln shelf, with kilnwash.
see ya
steve