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TL;DR
If your tickets aren't issued as one itinerary (different airlines, separate bookings), baggage usually isn't auto-transferred — you'll need to collect it after the first flight and go through check-in and security again at IST; there's no special transit corridor for baggage between separate tickets.
For flying with a dog, pet transport must be arranged separately with the airline: check in advance about cabin vs. cargo hold options, carrier requirements, and extra fees — this is a separate process from normal baggage check-in.
To check if it's a "single" ticket, look at whether the whole route is under one booking (PNR) — if it's two separate tickets (even with the same airline, e.g. Adjet-type connection), baggage may not be automatically checked through to the final destination.
Arriving in Istanbul on separate tickets (different airlines) means you'll collect your baggage in the arrivals area, then exit and go through passport control and check-in again for the next flight — there's no dedicated transit corridor for carrying baggage between separate tickets.