So what data do you ACTUALLY collect?
In general, the answer is that most of the data we collect are things you explicitly tell us about. So for the most part, we only know it if you tell us it!
As an example, if you tell us your dog's weight, we'll know that. If you tell us your phone number, we'll know that. But if you choose not to tell us those things (or if -- as last resort -- you make up false answers!) we won't know them. We don't have any way of getting any of this sort of personal information from "behind your back" (and neither would we want to!).
As regards things like your photos, we only have access to those that you explicitly share with us. So if you put a photo of your dog on your dog's profile, we'll obviously have to store that. But that doesn't mean we have access to all your holiday photos. And we never have access to your address book or anything like that either.
There are some exceptions to this rule of "you have to tell us for us to know", including:
Obviously our devices automatically measure things about your pet (which is why they're useful) and we collect and store that information. This typically means your pet's activity levels, and (under certain circumstances only -- see below for more detail on that one), their location.
Sometimes your phone will send us technical information about its version number, serial number and so on. This is automatic and can sometimes help us to debug issues that only affect certain phone models, etc. But we're not using this information to "spy" on you.
We do sometimes "log" that certain things have happened in our system, and that information could tell us about the way you've used our app. Sometimes we do this so we can monitor and improve our service (including by understanding what you're making use of so we can talk to you in useful ways). But we're not trying to be "sneeky".
Where we offer services in collaboration with business partners, they might send us RELEVENT information about you. So if, for example, you are offered a PitPat by, say, your insurer, they need to give us your address to send it to. But you can rest assured that THEIR privacy policies will mean they can't generally share anything more with us than what is actually NEEDED to fulfil what you've been promised, and neither would we want them to.