• When you RMB the cat, you will be able to pet it and hear purring sounds.
• When you RMB (you're also gonna need sneaking) the dog, you will be able to pet it and hear barking sounds.
• By the way, when you RMB the fox, you will be able to pet it and hear sniffing sounds.
• When you hold shears in your main hand and click RMB on your dog, you cut off its collar and it becomes a wolf.

Additional cat/dog content is possible in the future!