Should I get a new pup if current dog is jealous?
Hey everyone! I'm brand new to the forums and hope this thread is in the correct place.
Our dog's pawrents are having another litter (it is the same sire and dam) in about 2 months time (pups are ready in 4 months) and we are interested in another pup.
We currently own a 14 month old female GSD, Lyra (photo attached). She's a gorgeous girl who is very mature and has barely any major behavioural issues - except for one. She is incredibly jealous, or fearful, I'm not sure which. At the dog park, if we pat or give attention to another dog, she will literally put her body between us and stand in their way. She'll sometimes give a little high-pitched yap and sort of snap at the other dog, but has never (ever) bitten or started a fight at the park. She will only do this with dogs, not people. She stays by our side most of the time but otherwise plays really well with other dogs.
We have also looked after 2 seperate dogs, each for 5 days at our home. The first dog (Ziva, a female husky x rottie) is 8 years old and more experienced. Lyra kept doing her jealous thing until Ziva had enough and they engaged in a brief but loud fight. After that, like magic, we could pat and talk to Ziva while Lyra had no problems.
However when we looked after the second dog (Ruby, an almost 2 year old female working line GSD), there was a bit of trouble. Ruby had not been socialised well at all and was very submissive. Lyra took full advantage of this and dominated Ruby completely. When we opened the gate, Lyra literally blocked and stood over Ruby, saying "I am the one who greets them first, NOT you". When Ruby had a toy, Lyra wanted it immediately even if it wasn't hers. They had a couple of quick fights but nothing was resolved. On walks, they were great together, and in general got along nicely - but when the humans were involved, different story! However: Lyra was in heat while Ruby was around! This likely had a significant impact.
So this is why we are a little unsure of adopting another puppy. It will be her full-blooded sibling, will this impact anything? Will a male pup or a female pup work better with our situation? And I know for a fact that when we are at the park, Lyra never gets jealous over other GSD puppies, we can even pick them up and snuggle them and she won't mind.
Any advice is appreciated! Thanks in advance!
(Oh and P.S., Lyra is NOT spayed and is on a raw food diet. We will consider spaying her if a new dog is introduced.)