She's playing with our pet OR She plays with our animal, but not She plays with our pet...
"Sie spielt" can either mean "she plays" or "she is playing." "Sie spielt morgen" even means "she will play tomorrow." German does not have a distinct present progressive tense, so it is flexible this way.
I think Kwelta is pointing out that pet and animal should be interchangeable whether we say "is playing" or "plays". It seems as though he/she couldn't use pet with "plays".
In dative, m/n : unserem, f: unserer, plural: unseren. A nice link to complete chart can be viewed at: https://deutsch.lingolia.com/en/grammar/pronouns/possessive-pronouns. Hope that helps.
"pet" is "Haustier"; presumably they mean a pet but I would say "animal" if it says "Tier".
Germans do call a pets "Tier" as well as "Haustier". The meaning is understood. Pet should be accepted.
Thanks for the response kyky. Oddly, one of the acceptable responses listed is: 'She's playing with our pet'. I will take your advice for Haustier (housepet, I assume) only for pet.
The thing is that said "Tier" belongs to them. That makes it likely to be a pet but it could also be some other animal.
Unsere vs. unserem. What is rule, again? This is giving, continuous, confusion.
Adjective endings depend on case, number, and gender, but they are also weakly or strongly inflected depending on whether or not they are accompanied by a definite or indefinite article or not.
That is to say, there is no one rule: it's a grammatical system. The following links take different approaches in presenting more information and may help you: