when animals die, do you think they go to heaven?
yes or no:
no, because I don't believe in heaven
no, because they are not allowed
yes, they are allowed
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if you want to go religious on this (which the question states that it should be with the assumption there is a heaven) there can be only one clear answer... that or you can consider yourself a heretic from deviating from your religion (😉)
by coincidence, I'm currently working on the interaction philosophers had with the church and it subjects in the southern lowcountries at the prelude of the french revolution
taking into account that their vision has not changed from that point till now, the answer would be : yes
In the letter archbishop van Franckenberg wrote in 1782, he claims philosophers have as intention to make the humans like animals; with being voluptuous and amusement of senses.
Then he goes into explaining it more, and states further on:
"that these animals should not fear Judgement for they have no sins"
he was refering to "real" animals here (dog, cat, ... not persons "infected" with philosohpy)
so, taking that phrase, yes.. they do go to heaven and are sin-less.
(The letter was received by the pope and van Franckenberg received congratst for his currage against this desease)