Have a 7yr old Chihuahua mix, a 4yr old Pom, and a 1yr old Retriever.
The retriever is the newest member, having arrived 7 mnths ago.
The retriever and pom get along about as well as expected, basically they'll play for a few, but the retriever knows he likes his own space, and just knows that the pom is not a very playful pom...there's no problem between these 2. Nor is there a problem between the pom and chihuahua, they are not best friends either, they simply sleep together to keep eachother warm and that's it....they don't play together, nothing, so it's not like the 3rd member is distrubting them.
My problem lies in the chihuahua and the retriever, my 2 dogs, I'd say 40% of the time they get along, the other times the chihuahua will growl or even snarl at him if he's close by...the retriever doesn't have to be doing anything, the retriever always backs down and will even lay over on his side. To me, it seems more of a jealousy issue, as the chihuahua is a dog I've had for 6yrs, but he was raised with a big dog, so I know it's not the retrievers size that scares him.
3 things I know could be causing the problem:
1. With the retriever being the puppy, he is getting more one on one exercise, training, and just as happy as could be walking in 10' of snow and ice cold temps....the chihuahua HATES cold weather, so I don't walk him in the winter, otherwise walking them together's not an issue. The chihuahua sleeps with me, always, whereas the retriever sleeps in his crate, all dogs get equal treats, and I try to spend as much one on one time with my 2 dogs especially, but it's hard.
2. The retriever absolutely loves the dog park, my 2 other dogs hate it, but they do enjoy car rides, going to Home Depot, etc....so I always try to make sure they get the car rides, and the retriever gets the dog park.
3. I know 4yrs ago when my chihuahua had his blood tested his thyroid was a tad below normal, I need to get him tested again, as I'm wondering if low thyroid could be causing attitude issues
Also, this chihuahua has gotten to where he'll growl at me at times, like if I'm checking his teeth (all are finr and clean).
Health wise, this dog's in great shape with no medical issues, except perhaps the thyroid
Any advise would be greatly appreciated, I never thought this issue would continue 7 mnths after introducing the puppy. Also, the puppy does not overwhelm him at all, there's only a few times a day that I see the puppy even go near him....this isn't the relationship I wanted for these 2.