What would happen if you need to bug out, or if you don't have enough food to feed your pet? Would you find a way to provide for them? Would you eat them?
I know, this isn't a favorite topic for anybody, but it's something you need to think about.
Dogs:
As much as I love my dogs, I wouldn't keep both of them. The chihuahua is too noisy and loves to dig. The lab is my son's autism service dog-in-training, and would help to mitigate his meltdowns, so I'd keep K-Dog. I have already begun to feed them home-grown food: chicken, veggies, and store-bought rice or oats. They don't get a lot of treats so it won't be a big deal to eliminate them. Plus, any extra animals we kill that I wouldn't be able to force my family to eat (squirrel, prairie dog, etc), I'd give to him!
Cats:
We don't have any. Yet. But if we did and the cat was a good mouser, we'd keep it at home. Traveling would be a different story. Can't see myself carrying a travel-kennel with a yowling cat inside. Not when I could be carrying more food, clothing and water.
Chickens/Turkeys/Quail:
Chickens can be noisy, especially the roosters, so I'd have to slit his throat if I wanted stealth. I'd keep as many hens as possible, both of chickens and turkeys. Turkey toms (boys) aren't noisy at all so if I can hide them, I will. As far as quail goes, while they can be very noisy, I could hide them in a sound-proofed bedroom or garage. They are rapid producers of eggs and the fast gestation period means edible poultry in just a few weeks. Not sure I'd want to carry a cage of quail and their feed if I need to bug out.
Rabbits:
Generally quiet, this animals reproduces rapidly and is a great source of lean protein. Great for hiding in the house. Again, not so great for carrying around breeding stock and their feed.
Goats/Sheep/Cattle:
These are very very hard to hide! Not good for a stealthy source of protein or milk.
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What are your pets? Would you kill them before bugging out? Depends on the situation, huh? Yeah, us too. But as callous as this sounds, animals/pets can be replaced. People can't.